Had double bypass in July 2017 but still get chest pain although grafts have been shown to be working properly. One shot of GTN spray gives me a headache and doesn’t seem to help pain. At the end of a hospital appointment to demonstrate to my surgeon I made the mistake of of taking two puffs. Ten minutes later got a really bad headache and as there was bright sunshine I could not see anything except extreme brightness. I have had a headache and photosensitivity since last Thursday and it is now Tuesday of the following week. Just wondered if anyone else had had a similar experience. Many thanks for reading.