Hello!! I am into this 6 weeks and have been plagued by mild nausea and general feeling of not feeling well......still quite a bit of pain and pain meds were changed from codeine to Darvocet to counteract nausea......only take two tablets a day but the nausea and not feeling well feeling persists. Did you guys experience this? PT was daily and begin 3x weekly today......I do my exercises religiously.....have the other knee to do, but oh whoa!!!!!!