Suck it up sugarlips. Just a headache. I think P-Mo's got it, blood vessel dilation causing excessive blood to rush to your dome.
Are you taking in any caffeine? Caffeine can cause headaches in and of itself, combined with var maybe its doing you in. Try cutting out all your caffeine intake for a few days and see if theres any difference.
Ive never experienced a var headache before and its my favorite steroid, but even at 50mg/ed it gives me some rediculous lower back pumps to the point that I actually think my lower back will snap just from the intensity of the pump. So I wouldnt doubt it could induce a headache.
Also are you taking a UG product? Sometimes they are overdosed to get good feeback. There was a Canadian UG a few years back overdosing their var by double the claimed dosage, and getting some gnarly feedback. This was confirmed by an analysis done by SRCS. Some guys were running what they thought was 100mg/ed (but was actually 200mg/ed) and they were reporting all sorts of side effects related to blood pumps. I recall one guy saying after deadlifts his lower back would become so pumped he couldnt bend over for an hour as his back was as stiff as a steel girder.