Ah bless you....I still feel the cold (I mean like I'm in the Arctic) and I am over 4 years out. At first I put it down to like going cold turkey from eating all the crap and my body getting de-toxed but as the weight fell so quickly in the first year, I realised that it was due to the fat that had kept my body so nice and warm all these years no longer being there.
I found that exercising helped as it made me feel better and the increase in my metabolism seemed to kick-start all sorts of things in my body. But when I let that slip it's back to the layers of clothes, hot water bottles and plenty of hot drinks and soup for this gal. Just be thankful you're losing the weight and you can get some great thermal underwear that will show off your new figure