A Few Months Ago I Started To Get Bad Bad

a few months ago I started to get bad bad pains in my neck shoulders,lower back hips.i really didn't pay attention but present time it feels like my bones r going to break I cannot hardly walk I need help getting up and taking my first steps my pelvis feels like it is splitting I half. I think it all stems from my neck which always stays swollen. I feel like im going to die like something is eating my bone tissue and the pain is off the chart when I went to doctor they think its lupus how can a perfectly healthy person become so sick almost overnight to being bound to a wheel chair that's how bad it is