The Crash?

I had my mirena out about 7 days ago and have felt somewhat better. Cramps and fatigue were gone but the tingling remained in my hands and feet. Then 3 nights ago I felt absolutely exhausted after work and then yesterday I got up off my chair and had this incredible shooting pain in my foot and crumpled to the floor because I couldn't support my weight. About a minute later, I have had a cramping foot since then. Tingling is getting worse up to my knee. I am so tired I just want to sleep all day (which is not going to happen with only 7 sick days a year and 3 kids!).
I have an MRI on monday to rule out MS, but I really think this is mirena related because right after I had the tingling begin I had tremendous uterine cramps that went away immediately after removal. This is the worst decision I ever made...and I've made some doozies!!

Is this the crash?