Is it normal to get a wave of sick/hotness when I stretch my back?

so I have scoliosis, and just asked the same thing in another reddit but they deleted my post lol. I am currently undiagnosed with pots but 99% sure I have it (doctors are a NIGHTMARE tho)

every time I notice I'm in really bad posture I sit up straight and flex my shoulders back, but a minute after I get hit with an INTENSE hot sick feeling, I am also currently in the process of being diagnosed with POTS (afab) but I don't know if that's related? any solution would be great as it always makes me unable to function after and the back pain is unbearable. People suggested in the other reddit that it was to do with my pots, so that's why I thought I'd also bring it up here

I am usually in bed all day everyday too so keep that in mind, I know I should exercise but I literally can't because it makes me feel so sick