Feeling cold a lot - is this normal?

I am 5 weeks post op and down 32 lbs. The past week or so I have been freezing! This morning about two hours after I had gotten up, I was so cold I had to get back in the bed and pull the covers over my head in attempt to get warm. Last night when I went to bed my feet were so cold I had to take my socks off and rub them until they warmed up. Then this afternoon while driving the car my hands felt like they were cold down to the bone. I had my daughter rub them and she could not believe how cold they were. I'm figuring this must have something to do with the weight loss, but is this normal? My friend suggested it could be caused by low iron or some other vitamin or mineral deficiency. Anybody have any ideas?

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