Hey everyone, my name is David and I am 24 years old. I joined to try and get some answers to what might be going on with me recently. After searching the internet with what is going on with my heart rate, it seems that POTS is the only thing that comes up. First, let me say I have an anxiety disorder that has left me basically housebound, so it's very hard for me to travel far for tests and such. Let me start with my story. All through December I seemed to have had a persistent chest and back pain. I noticed the symptoms were getting better day by day rather than staying the same or worse, so I self diagnosed with a pulled muscle or something similar. On Jan. 8th, I was walking down my stairs and had a near fainting experience, which never happens to me. My heart rate jumped to 140 and I was also having an anxiety attack with it. I called the paramedics and everything checked out and didn't see any reason I should go to the ER. The next day, my heart rate jumped when I stood up so I called them again. With some serious convincing, they talked me in to going to the ER just to get everything checked out. Everything did in fact check out (chest x-ray, EKG, blood test). Fast forward to today, I am still having a 30-40 jump in heart rate when I stand. I do not, however, have any other symptoms that seem to be related with POTS. This has made me very confused as to what this is or what could be causing this. I remember having something similar to this about two years ago that lasted a week or so and eventually went away. In conclusion, this is the 15th day of me having these symptoms of tachycardia upon standing, but I have no other symptoms associated with the heart rate increase other than anxiety and some palpitations. I am trying to get to my doctor on Tuesday, which is familiar with POTS (my mother talked to him), but he said he would like to do some other tests first. Any help would be greatly appreciated. It just seems that being a 24 year old male with a sudden onset of these symptoms would be fairly rare for it to be POTS from what information I have gathered. Also, without any dramatic changed in BP that wouldn't be considered normal fluctuations upon sitting and standing doesn't really seem to make sense to me. I have found myself constantly checking my heart rate and BP with my home checker. One last thing, it seems that the worse of the symptoms are when I wake up, and the longer I stay up, the lower my RHH gets. When I have been up for 12-14 hours, my RHH will be in the mid 50's low 60's. Even with the lower RHH's the standing will still raise it 30-40, but it won't get in tachycardia ranges. Only in the morning when my RHH is higher will my heart rate get in the 110-130's with standing. Thanks for reading and hopefully I can get some answers.