That sounds like good advice.

I'm on day 7, and I'm currently in bed with a few layers of clothing on, a knitted hat, and I pop a pair of gloves on if my hands start getting cold.

I'm sorry to hear about your troubles. Have you tried aerobic breathing to help with your circulation and generate more heat? Odd as it sounds, doing the aerobic breathing really takes a bit out of you if you do it correctly and for 20 minutes!

It goes like, a light exhale, then a full long inhale through your nose until you can't take any more air, a complete exhale of ALL air through your mough then hold the emptiness of oxygen for 8 seconds and then the inhale. repeat. It is aerobic and it can be strenous and will clean your lungs quite well while it oxygenates your body.