I am feeling anxious, tingling right side of body, tightness back ofhead, lightheaded, difficulty concentrating, sense of impending doom, nervousness?

Nervous&lightheaded. Your symptoms can come from a variety of causes. They may be medical or psychological (anxiety) or a combo of both. Please see your doc. If he/she rules out medical, please see a mental health professional to learn strategies for stress management. Be sure to mention "impending doom" which MAY be related to OCD but not always. Peace and good health.