Feeling a little sick. increased saliva production, swallowing excessively making it hard to sleep, burping more. swallowing leading to nausea.

Multiple causes: Certain drugs can do it, mettalic taste & increased salivation due to vitamin defeciency. Need to check your diet intake and consult your doctor.

See PCP- 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, weakness in legs, tingling, insomnia, increased saliva, speech impairment, tremor and sweating. Depending on the cause of your anxiety symptoms, your health care provider can provide you with treatment options.