Thanks for the reply fredscarecrow (for some reason the ipad won't let me quote you)
i have also tried sumatriptan for my headaches, it's a migraine treatment but I was told to try it anyway. It was awful, it causes blood vessels to constrict so you get tightness and heaviness in parts of your body. It did nothing for my headache and make me feel like I was dying!
Im im a bit reluctant to try the gabapentin now after that experience, it's difficult when I'm trying to revise for my exams. I think I will speak to the consultant again about leaving it a couple of weeks. I am taking paracetamol every four hours and although it doesn't get rid of the pain it helps me manage it better so I can sleep more comfortably, it also doesn't make me feel sick and groggy so I can get on with my revision!