I Have Had CIDP For About 17 Years Now 11

i have had CIDP for about 17 years now 11 of which were MISdiagnosed as arthritis. I am 80 years old and have been feeling poorly for about 2 months. I AM ON A WEEKLY INFUSION AND HAVE BEEN FOR ABOUT 6 YEARS. I AM EXTREMELY TIRED AND FATIGUED ALL THE TIME, HAVE TROUBLE WALKING BECAUSE OF MY BALANCE. I USE A CANE, WALKER OR WHEELCHAIR ALL DEPENDING WHAT I AM DOING. I AM FRUSTRATED AND DEPRESSED ABOUT NOT BEING ABLE TO DO THINGS. Can you tell me what might be going on? thank you.