Gosh, nopurse - it's awful early to be having such thoughts about your new knees. Only 10 days!!! A few years ago you'd still have been in hospital!
Sounds to me like you are doing a tad too much and could afford to take it a bit easier for a week or so yet. I don't mean stop, just maybe ease up every third or fourth day. Give yourself a rest and a break, in other words. Plus don't forget, you'll be hitting those post-op blues as well.
And to answer your final question, yes some pain killers can very much cause hot flushes! I had an experience with that myself some years ago and got upset and tearful because I felt so lousy and the doctor seemed not to be taking me seriously about it. I also got a feeling of swollen glands in the neck. He ended up sending me to a gynaecologist about the hot flushes, an ENT surgeon about the neck glands and a psychiatrist about the 'depression'!! I underwent numerous tests and investigations until a colleague suggested I go see the occupational health doctor who immediately asked me if I had any back/neck problems and if so what meds was I on. So I changed to something else and the symptoms disappeared almost overnight!!
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