I had high blood pressure in the 150s was put on bp meds so I stop eating salt for one year and exercise now I get lightheaded when standing help.

Check again. Go get your BP checked again. Your diet and exercise changes may have improved your BP to the point you no longer need the medicine. Nice work! Good luck!
It is POSSIBLE. that your doctor may want to adjust the dose of medication you are taking. Do not do this by yourself but please return to your doc for an exam. Peace and good health.