55 female diabetes and high blood pressure take meds for both. head gets swimmy and leg's buckel. need to know why?

An answer would require a full review of your history, exam and likely some testing. The symptoms can represent several overlapping conditions.

Anti-hypertensive medication can cause postural hypotension that may explain your symptoms. Do not get up suddenly, e.g., when getting out of bed sit on the edge of the bed with your feet dangling for half a minute or so. Drink enough water so that your urine is mostly colorless, that will avoid dehydration. Wish you good health!