SSDI...I am in process and they have scheduled a couple of different Dr. appointments...very anxious and wondering if anyone has any insight to add

Hi..I don't post usually, but I am going through SSDI process currently and they have scheduled a couple of different appointments for me. One is medical and the other is a mental examine, I believe. I was diagnosed with Fibromyalgia in 2010 and have some other medical issues going on as well. I am wondering what this may mean? Or what possibly I can expect when I go?? Any insight would be very appreciated. Thank you and gentle hugs to all !