Struggling with Multiple Autoimmune Diseases and No Answers

i have endometriosis, POTS, hashimotos hypothyroidism, & celiac & now the Drs. want to run tests for lupus. i know it’s common to have autoimmune diseases overlap but not all of these are autoimmune and i’ve never gotten sufficient treatment or causation explanations. i typically just get told to go on a new medication and that my blood work looks weird but they don’t know what it means. i’ve never seen a doctor who seems to understand the connection between these conditions well enough to treat me. i’ve gone to specialists in each field- endocrinology, gynecology, cardiology, neurology, etc. but i just keep getting bounced around from specialist to specialist without any real help. i’m feeling really down & would appreciate any encouragement, tips, recommendations or support :( thanks guys <3