Hey there,
Yep I got the headaches too....
To be honest, I am not sure why I take the tablet, I have no problem in getting it up, it is just that I like feeling why I have taken the pill and get a rise, it just feels fuller....
I do take a headache tablet to combat it though....
I have got some Cialis to try out too and also some cabergoline...the cab is supposed to greatly reduce your recovery period and prevent that little neggy bit after the climax.