What causes SAH-like headaches despite its treatment?

Hello doctor,

Five months ago, I had a SAH and was in the hospital for 20 days including 11 in ICU. After leaving the hospital I was improving till one month after the hospitalization. I had a really bad headache which was similar to before my SAH. After this incident, my blood pressure increased and I have been prescribed various blood pressure tablets since. I currently take 2.5 mg of Indapamide each day. Also, from that day on I have suffered from chest pain on the left side. Pain is 2/10 and is almost constant. I have had two ECGs, chest X-ray, and blood tests, and am awaiting the result of a CT scan. But, so far, my general practitioner cannot find anything- in fact, one has said that he does not know what it is, but I know what it is not. It is not your heart, it is not a chest infection and it is not angina." Last month, I saw a consultant radiologist who showed great concern that I was suffering from angina and that this could impact my further treatment. I take a long walk (three to four miles) twice a week and I am strong after my visit to the hospital last year. I have never smoked and do not drink alcohol. I only get out of breath after strenuous exercise, can lift and use my left arm okay, and do not get any real pain anywhere else. Can you suggest what I might be suffering from I am worried about strokes and want my treatment to continue?