high blood pressure
"I have been on this medicine for almost 2 months.  
On the plus side it lowered my blood pressure effectively.  My readings are excellent!
Now the minuses.  I always feel lightheaded and dizzy.  My mouth feels dry and I keep feeling like I have to clear my throat.  Everyday around 2:45 I become extremely tired and nod off.  It is hard to fight through this. I constantly feel queasy.  5 days ago around the same time I started feeling extremely nauseous and began to sweat heavily.  When I stood up to go to the bathroom I felt dizzy to the point I strongly thought I was going to pass out.  My vision also became blurry.  I sat on the floor, then laid down.  Within 1 minute the feelings subsided.  I think this is the medicine doing this."