Last year after some testing I was diagnosed with IST.  My Dr was very dismissive and stated it "just something women in their mid twenties get sometimes" he prescribed me metoprolol 25mg which did seem to lower my heart rate for a couple months but then stopped working for me. When I told him that I was still tired, dizzy, fainting (especially upon standing) that it was just something I would have to live with. I work in the healthcare field and I know some things. I questioned whether I could possibly have POTS instead. Once again he was vey dismissive and told my they were the same thing. Long story short I suppose I'm trying to ask if IST and POTS are the same thing  

IST and POTS are different conditions and require more testing than it appears you have had. Check the links and read what is involved to confirm a diagnosis of POTS

Hope this helps,

Dr T


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