I have been tested for stds, uti and yeast infection several times all negative but i have itchy/ pain symptoms what could it be? no doctors know

Anxiety: symptoms are not a sign of illness, they are the mind's ability to produce the "flight or fight" response which gives rise to many physiological changes include heart palpitations, nausea, sob, insomnia, dry mouth, speech impairment, tremor and sweating. Depending on the cause of your anxiety symptoms, your health care provider can provide you with treatment options.