Welcome to Mayo Clinic @tabathab . Im really glad that you found us. You have had much to deal with and then come to find out that its caused by an autoimmune disorder. The best thing you can do is to educate yourself. Use the discussions on this forum and start following the Autoimmune Assoc. https://autoimmune.org/resource-center/diagnosis-tips/
Do you have a good rheumatologist? Good ones are well versed in autoimmune diseases. Develop a connection with this doctor so you can be followed through the years.
You will probably have good days and bad days, I think we all do. But, I know you can do this!