Pontoon, I am only 4 days ahead of you and I, too, get that tight band feeling, swelling, pain in the calf, knee - oh, allsorts of things! I use the bike as I find this keeps my flexion and loosens up my knee but I don`t exceed 10 mins max once or twice a day. I start off with low resistance and set the seat high enough that I easily obtain 100/110 flexion. After 5 mins or so (sometimes more, sometimes less depends on how the knee feels at the time) I lower the seat and increase the resistance. I do stairs, I walk, I potter about. I do allsorts of things to keep mobile but I stop if I go beyond the point of discomfort. I am now at the point where I feel that I have more control over what I do. Yes, I probably do too much at times, other times too little but overall I am at peace in my recovery, albeit with a long way still to go.
It`s frustrating and we all have the need to try and speed things up but this knee thing is stubborn and seemingly with a mind of its own which seeks at all at times to thwart our best attempts to expedite recovery. The trick is, I think, to make peace with it, go with the flow and push just that bit beyond comfortable but not to the point of pain. Progress often seems to be realised retrospectively!