Morning Katie, and welcome to the group. That is not my diagnosis but yes there many people here that are on disability with MCTD. My lungs are shot and I was fortunate to not have any problems with getting on Disability I have always heard if you get turned down the first time to get a lawyer. Like I said I was never turned down but it I would not miss around Since they don't get paid if you don't and it can take forever to get approved. I sympathize with you about never knowing. I have o2 all the time but sometimes i feel I can at least work at a desk. Other times I wake up in the morning and can't get out of bed. So it's true ya just never know with this stuff. I could just see me tell a possible employer I'm a good worker but you can't count on me. LOL. Sad but true. Oh I'm 51 years old. I'm sure others will be here to help answer your question and I hope you choose to stick around and be part of the family.