Suffering From Fatigue, Cidp, Ankylosing Spondylitis, Persistent Yawning. Are There Any Remedies?

I have two sort of rare conditions. cidp and ankylosing spondylitis. I have ivig treatments twice every 4 weeks for the cidp. I used to take treatments for a.s. but haven't in a long time because I can control flare ups with otc meds. my biggest ongoing problem is fatigue. not just being tired but overly tired but falling asleep easily, not having the will to do anything. it seems like all I can think about is sleep. constantly being overly tired and yawning all of the time. what is out there for fatigue? I have seen some stuff about diet, antidepressants, stuff like Adderall and Ritalin. i have seen my neurologist and family doctor but as of yet have come up with a solution. do you have any knowledge or possible treatments for helping me?