Can I get a tummy tuck, lipo of the flanks and fat transfer to buttocks if I have P.O.T.S?

In November of 2016 I was dx'd with postural orthostatic tachycardia syndrome and I am on 12.5 mg of metoprolol to slow my heart rate. I get dizzy often and my heart races still but I want the Tummy Tuck. I'm down to an 18 from 24 hoping to lose more of course but it seems that my belly pulls giving me pain in my back and lower abdomen. I also have fibroids so that could also be the abdomen issue.