Toprol-XL and horrible headache

I am 32 years old (female) and I was put on Toprol (25 mg) for a high blood pressure incident. I've been on the medication since Christmas (2005), so it's been almost a month. I have been tired, but not extremely tired. Some days are more difficult than others, but I spend all weekend sleeping just about...if I don't, then the week is very difficult.

I did start working out after taking this medication, so my energy level is improving now. But I still have this incessant headache. It's not a horrible headache like a migraine, but it's just always there...always, until I fall asleep, and then it's gone!

I must add however that the Toprol is contolling my high blood pressure well, and hopefully with excercise and diet, I will be weaning off of it in a few months.