Kelly, I just saw this post so it is to late to give you any advice. I have only had IVSM once and it was for five days. I could only sleep for four hour for several weeks after getting the infusions. I did not really get any quick relief and my neurologist suggested that was because I did not get them more quickly after having my first major flare.
I actually lost my appetite and lost almost 50 pounds in the weeks following my infusion. That was the only benefit

One thing that I realized in retrospect is that steroids increase my heart rate by quite a bit. This has happened when I have been on oral steroids and have had steroid injections too. I always have weird reactions to meds.
Hope you get some more relief.