I was having the same problems with Revlimid my onc starded my treatment with Darzalex, Dex, and Valcade once a week. I also have Zometa every 3 months for bone strengthening. I've been on this treatment for 9months now and my numbers are very good and I'm feeling a lot better

I recently got off of revlimid because of those same issues. I complained to my oncologist but he ignored me. So I got a second opinion from a specialist. She took me off for two weeks and the diarrhea cleared up and the stiffness is much less. So the specialist is now my oncologist and she took me off revlimid altogether. I feel much better. I'm doing Darzalex faspro weekly and vecade weekly.
I did some research on the revlimid website and long term affects of revlimid are horrible. I told her my concerns and no more revlimid. Make sure your doctor is treating you and not just the MM.

I have so much trouble just getting into. Rolling over took so much effort. I could not turn around and to the back seat of our truck with out Severe pain.i was test for Several things. One was lyroid. My lyroud numbers were very high. Iam on levothyroxine. I can move without pain. So maybe go have your thyroid checked hopefully that's the cause of a pain. I am back on 5 mg the diarrhea still is a problem, I can't go anywhere without a bathroom. That is just revlimid. Good lucky.

Try b12 vitamin, for some people work, some don’t, best

So sorry to hear that your having potential issues with Revlimid. I have been lucky-I seem to tolerate it pretty well. Aside from morning fatigue. I would talk to your team...The best!