POTS?

Hi everyone, M29 has been going through a really bad time for some time. On October 19th I had a bad flu that lasted about 2-3 days with a fever of 39.5 and a strong cough that literally kept me up all night. From here the insomnia started with 3, maybe 4 or 5 hours of sleep a night, night sweats but only in the first part of the night and pappitations. This lasted about 2 and a half weeks and then it stopped and I started sleeping again, without sweating or palpitations for about 10 days. One evening I played sports and skipped dinner, also drinking beers with friends, since that night it's as if everything had turned back on, added to this was the sensation of dizziness when I walk. Palpitations happen to me when I'm sitting but in stressful situations and especially when standing or if I make even minimal efforts. I started taking Xanax 0.5. Prolonged release Mg, the palpitations tend to slow down a lot, almost disappear and the nights I take it (not all because I don't want to create addiction), I sweat, but I also sleep 7 hours with only 1 awakening. My main problem remains fragmented sleep with few hours, palpitations and night sweats (sometimes I happen to wake up and literally feel hot flashes), if I sleep with the window slightly open, I notice that I don't sweat. Have any of you had similar symptoms? I don't know if it could be POTS or some form of post-flu. Has anyone had similar experiences?