monique - thanks for the reply.

The headache (strong pain) seemed to have started in the begining of rides, it seems to happen when I push hard to quick. One time I noticed I got the head pain right after going up a hill (heart rate went up but not max) Then another time was just on a flat but I was pushing hard. I went for a ride yesterday and wanted to catch up to someone riding in the distance so I started to pedal harder and faster then into a sprint and I got the head pain again. The head pain always subsides shortly after I get it.
I'm not sure if it is blood pressure related or dehydration? It is very strange though because I have pushed hard many other times and I was fine no headache. Perhaps I need to warm up before I push so hard? Even still this does not seem healthy....

tammy