if you are a new user of blood med tabs it is normal to feel that way as i did.i did take 2 25m tabs a day. but now i just take 1. and i also take vit a c e in the mornings with my blood med. stay away from salt suger and spicey foods drink lots of water and less coffee i have 1 cup in the morning and thats it. my blood press now is around 90 and 110 now. i smoke and drink a beer and i am working on stopping that. as that is no good for blood press.
Your dose could be too high. You could try taking it in the evening before bed. You could also try to stand up slowly, which slows the rate of blood flowing out of your head. If you continue to feel dizzy, talk to your doctor about alternatives.
tablets could be too strong and causing a drop in your bp
your doctor should check you with 24 hour monitor
as single readings can be way off the mark