I agree with you Mary Ann!! I've been on 10mg Revlimid for almost 4 YEARS now and I go through periods where I do have cramping, but they are never bad enough for me to even consider giving up the Revlimid because it is working so well!! My methods of combating the cramps are as follows"
1. Increase salt on my evening meal
2. Drink a large glass of Schwepps Indian Tonic Water - which has quinine in it
3. Increase my daily walking and try to include some stairs - generally at the hospital when I'm going for blood tests as everything here is built FLAT
4. Have a soaking HOT bath every second day
5. Sleep with a bar of plain soap in my bed!!!
The cramping in the chest must be terrible, but mine has only been in my calves and feet. Fortunately it only lasts for a day or two and usually comes on at night, but I can appreciate how painful it is. Still, given the results that I have benefited from with the Rev, this is really a small price to pay and as long as I practice all of the above, I can manage it! Best wishes, and perhaps some of these tips will work for others. Cheers, Cath in Australia