you'll be just fine. its normal to feel nervouse and scared anytime you have a procedure done. just think of what you've done to get to this point and where you'll want to be in the next few years. don't worry and good luck!
it could be gas from the surgery still. i had major issues with pain on my left side, especially in the shoulder, up to 1 1/2 to 2 weeks after surgery because of the gas. if it persists on a regualr basis contact you dr.
you are suppose to stay on the bp meds after surgery, but make sure you check in with your personal physician regulary. sounds like you need a adjustment to your meds. make an appointment asap because you do not want to pass out anywhere, especially behind the wheel of your vehicle.