So sorry you are in pain.
I have been using ginger and turmeric for the last 2 days. They are natural anti-inflammatories - supposed to be good for MS - we'll see!
You can get both at the health food store. The pain comes from inflammation, so if we can get rid of that, maybe we can get rid of the pain. Since these are supplements, they may take a while to work.
Personally, if you need something to manage pain, you should consider taking it for now. If it is MS, being sleep deprived only exacerates symptoms.