Would definitely recommend a check with the doctor. I am having the same thing but tend on being on the low side of blood pressure, especially after my surgery. I am careful when I get up and if the dizziness doesn't subside immediately, I sit back down. Better to sit down then fall down is my motto. Make sure you are keeping hydrated as others have said. I try to drink 80-100 oz of liquid a day to keep hydrated. It's a challenge but I've gotten into a routine that works for me. I hope all is well with you and that this is just a passing thing.