What is considered a normal blood pressure?

I'm 19 weeks post distal RNY; lost 90lbs. so far. I've been feeling really weird in my head lately, sort of like a spinning sensation. When I stand for too long, it feels like I get a cold-sweat and like I'm going to pass out. My blood pressure lately has been something like 100/58, whereas it was normally reading something like 128/78 or something. I'm wondering if the symptoms I am experiencing is from low blood pressure? I see my surgeon this Thurs. for a follow-up and I will be sure to ask him about it. But for now, I'm just wondering if my suspisions (sp?) are correct. If yes, I suspect the cause is from dehydration b/c I've been very bad - haven't been drinking my water as I should. Or maybe it could be related to starting up on Zoloft again? OK, OK, I know you're not doctors. YES, I WILL ask my dr. about it. And I will drink more water. Just wondering about the blood pressure thing; what is normal? TIA.

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