I have to go to a dermatologist and an esthetician to get my back treated, so I have to completely lie down on my back ㅠㅠ Of course, I'm not lying on a regular bed; there's a hole there to keep my face from touching it, but I think lying upside down is bad for my nose, so I think I shouldn't do it at the beginning of the surgery. Can I do it after about 6 months?