I've been on antibiotics for a uti for 3 days now and they seem to be working, I've also been drinking lots of cranberry juice. This morning around 3am I woke up with a horrific headache which I still have now. Sleep hasn't got rid of it and no matter what I do it won't go away. I thought maybe this could be due to the cranberry juice? But then around 3 hours ago I started feeling heart palpitations and my chest keeps tightening and I have to keep breathing faster. Its really uncomfortable and I'm getting a bit worried. I'm going to ring my gp at 2 when they open again to see if it could be down to the tablets but I don't know whether to just get straight down to a&e. Chest palpitations are scaring me and my whole chest and neck is hurting help xxxx