So I Was Diagnosed With Scoliosis When I Was About

So I was diagnosed with scoliosis when I was about 12. I've never had many problems with it up until recently, or so I think. I've spent the past two years spending the majority of my day, everyday, lying in bed which I think could have caused a problem but I'm not sure. Anyway, usually once or twice a day, when I'm sitting, only when I'm sitting I'll feel this "weak" feeling come over my body. My body will feel very odd & I just feel lightheaded & quite strange. After a few minutes of walking around, it will go away I also have weird tingling/numb sensations in my body sometimes, & also dizziness when sitting. I've asked people about this & most blame it on my anxiety, which I know isn't the case. Im wondering if this could be a pinched nerve or something related to my back issues, or something way different! This issue does cause me some stress so any feedback would be great. Thanks!