If I feeling worry and I thought negatively about any thing I feel difficulty in breathing...And if I observe any thing pain or any skin rash or itching I googled it and thinking it may be cancer..there is pain in neck also.When I feel tension it increases cough and phlegm..I always thought about big and uncured diseases for small pain also and I fear lot about dying.What is this problem and there is any cure for this problem.. which specialist did I consult