Pre-E : any advice?

Na
Long story short: 
I had sustained elevated blood pressure around 140-149/80. The OB sent me to a cardiologist, who prescribed me 200mg of Labetalol twice a day. 
I felt pretty crappy without the medication, but now I'm on day two and it's just awful. I get a headache every night and I am horrified that I'm just pushing over what may be Pre-E. I have no other symptoms though. Just an obvious elevated pressure and headache. 
I haven't been seen yet since last week and I'm starting to worry. Should I go to the hospital just to make sure that everything is okay? I feel alright most of the day, just morning and night is rough and the pill makes it 10x worse.