I also get really bad headaches, I didn't know that this was related to BP though. I've been prescribed migraine relief in the past, and have also learnt to avoid certain foods: certain types of chocolate are the worst for me; plus one time I actually believed I was having a brain haemorrhage, my H worked it all out to the fact I'd made fresh coffee that day (the pot was still on the AGA, I was stunned that that was the cause - however that was the only thing I had done differently - I don't usually drink coffee). I can relate to the stabbing pains you describe and the 'bleeding inside the head' sensations. It would be interesting to see if there were any studies correlating to bp and headaches. Interesting.