Dear Welcome to HM We understnd your concerns I went through your details. I suggest you not to worry much. I sincerely opine that you should be having stress related head aches Other doctors could not find any thing wrong physically. That simply underlines this conclusion. Relaxation techniques should be useful for you. Good exercising habits also helps. Please describe the whole problem detail and post a direct question to me. I shall definitely help you with psychotherapy techniques to over come obsessive thoughts. Hope this answers your query. Available for further clarifications. Good luck.