Body Temp

I was diagnosed with Hashimoto's disease a couple of months ago and not sure why my body temp is so out of funk. Yes, I know that is is freezing outside (well unless you are one of the lucky ones), but I cannot seem to warm up since I started cutting calories. I have dropped 8 pounds in the last 5 days (mostly water weight) and now have freezing fingertips, toes, and shivering all over. Anyone else have this problem?