Poly Myalgia Rumatica Makes it hard to exercise butt...

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Hi everyone
Yes I have rheumatoid arthritis which makes it hard to do much besides walking. Sometimes not even that.
I'm 60. The RA was the devils birthday present to me this year. I had never really suffered till now. But enough downer stuff.
On my good days I can walk my pooch and feel great. I count my calories and since joining MyFitnessPal I've lost 10lbs!!!
I'm six foot and weigh 220 now. My goal is around 200 lbs. The first 10lbs went away easily, now I'm kinda stuck at 220.
I had the MFP calculator re-calculate for a goal of 205 by May 20. (My band from the 70's is getting together to play our 45th HS reunion!)
The calculator put me on a 1700 calorie track to meet my goal. I'm hoping for the best and preparing for the not so best.
Peace