Involuntary physical sensation is the most effective way to drawn the reader into feeling your story. Below is a list of sentences using involuntary and other emotional reactions. Feel free to use them.
 

A shudder coursed through him

He tensed

Her heart was slamming in her chest

His breathing was harsh and uneven

She tried to suppress the churning in her stomach

She said with a catch in her voice

His voice rough with regret

His voice ragged

Her heart hammered in alarm

The flurry in her chest left her feeling weak

Her pulse labored as she

He went very still

Closing her eyes, she hauled in a shaky breath

She rubbed her hands against her thighs

A funny catch in her voice

The muscles in his jaw tightened

Heat pumped through her body

Sensations washed over her

Feelings swamped her

A throbbing thickness engulfed her body, pulsating

Her heart pounded

She pushed her cold hands into her jacket pockets

The chill of anxiety drained her of any warmth

A hard cold reality settled like a deadweight in her stomach

Trying to quell a swell of panic, she

Tears welled up

She swallowed hard, desperation pressing hard against her chest

She wearily tipped back her head to relieve the tension in her shoulders

She tried to control the expanding panic in her stomach

Panic hovered just below the surface

Rubbing her burning eyes

Easing the cramp in her back, she dredged up a polite smile

There was a glimmer of something reassuring in his eyes

Her voice broke

There was a funny undercurrent in her voice

Relief shot through her

She waited for the awful tightness in her chest to ease

She was so tired—so damned tired

Her voice unsteady

She swallowed hard, her insides rolling with a mixture of relief and an overload of tension.

She fought her way out of the gray reaches of sleep.

Automatically tightening her hold on …….

She felt almost disoriented

Her stomach gave a funny little lurch

She clenched and unclenched her hands

..made her insides knot up…

the sudden frenzy in her chest

Taking a fortifying (deep) breath

Something about the sound of his voice with its slightly husky tone instantly eased the burst of anxiety

She wanted to put her head down on the table and weep.

..his voice hoarse with sleep.

There was an odd little pause..

His voice was gruff

She was shivering from a combination of cold and exhaustion

A large lump formed in her throat, and she had to swallow twice before she could ease it

She snuggled down, weariness fading into a drifting lethargy.

She watched his hands on the wheel

The set of his jaw indicated his reluctance

Fingering the spare button that was…

..a sudden tightness in her chest

The flatness of his tone caught her off guard

Her stomach clenched into a small, hard ball.

The corner of his mouth quirked again.

She allowed herself a tight smile

..experiencing a sudden chilling rush of self-doubt, she clenched her hands between her thighs, aware of the frantic pulse in her neck

There was a flurry of panic breaking loose in her chest

He gave her a humorless smile

Her face burning she …and something rose up in her …a perception

Awareness churned through her, making her heart labor harder

A disabling weakness pumped through her

His jaw bunched

She clenched her hands into tight fists

She winced, a rush of embarrassment climbing up into her face

A funny ache settled down in her chest

She experienced another flush of embarrassment

She shivered in the warmth of her…

A feeling of emptiness rose up in her chest

Her heart gave a lurch

Unsettled by the

Experiencing a sudden attack of nerves, she …

Her stomach, which had  been in an uproar anyway, shot directly to her shoes, the rush leaving an unnerving hollow in her belly

..aware that her pulse was going a mile a minute

She shifted uncomfortably and stuck her hands in her pockets

She made a nervous gesture towards the …

She stuck a smile on her face and held it, an ache of compassion filling her chest.

She found herself blushing

***Unexpected feeling stirred in his chest when…

..the trembling in his hands…

his expression impassive, she…

Her voice had a funny catch in it

There was a strained hesitation.

She tried to ignore the twist of guilt that made her insides knot

She kept her gaze focused on the table

His expression was fixed and shuttered.

The sinking feeling in her middle expanded

She watched him, feeling as though every drop of color had drained out of her face.

A painful contraction clutched at her heart.

**He heaved a heavy sigh.

**He tried to make his smile reassuring.

She gave an uncertain shrug..

She felt a rush of … gratitude or …

Experiencing an uncomfortable flutter in her middle

A huge ache formed in her chest when she saw

She tried not to give into the awful pressure in her chest

Alarm shot through her and she froze.

Steeling herself, she stuck a smile on her face

Her smile wavered and her stomach did a funny little barrel roll

An undercurrent of soberness in his eyes

Rolling his eyes in exasperation,

..her vision blurring

She exhaled heavily

Trying to will away the ache in her chest,

The lines are his eyes deepened.

A smile lurked around his mouth.

Managing to keep a straight face, she

The ….made her mouth water

The silence could be cut with a knife

She could feel the chill from five feet away

She nervously wiped her fingers