Hugs PattyLatty - I can't offer much more than that. I've never been on prednisone, somehow have avoided it to date. So I can't give you experience on that.
Heat makes me feel better, but my friend with MS has to stay well away from it. Since you have "Lupus-LIKE" syndrome, maybe it affects you more like it does her? Autoimmune conditions are so amazingly complex.... Maybe try a cold pack on one of your aching joints, if that makes it feel better, you'll know that for YOU cold works better than heat.