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Qdulany Hi, You didn't mention ice. When you work your kids harder than normal you probably ice them down or do 10 minutes of cold water on their legs. Ice while you sit at the end of every day.
I guess my first thought and something I used to say to folks I coached: You train to race, you don't race to train.
You are out there racing every day. You should be training every day conditioning for the job. If you can't afford to devote time to train, (ie you need the job to pay the bills) then you need to figure out how to minimize the impact of racing to train. Try icing on breaks or at lunch or both. Make sure you stretch in the mornings before you go to school, maybe do some reverse lunges 10 per side during the day. I would try to add some exercise to the day and see if that helps. I have still not tried to stand for four hours but I am walking and doing work with weights every day. No strength training purely endurance with body weight and free weights.
You can achieve good results either way but it takes longer to race yourself into shape than it does to train toward a goal. Can you "march" while you stand at school? Can you do isometric contractions upper and lower leg, butt?
Can you add some component of training to your standing? Then ice after your day or during lunch. Pick one of these suggestions and see what adding it to your day does for you. Always ice after the workout. 6 weeks is quite a way off in terms of healing. In that time you have to find something that will help with the swelling. Remember it takes only 14 days to loose 50% of your strength if you don't train. We lost a lot of strength both leading up to surgery and then during healing. Now we have to work to regain the strength. The exercises you learned to rehab are and will remain a part of your life. If you have stopped them to help you stand for class you need to start back. Now you need to keep doing them and continue to build your endurance.
So get back to your stretching and rehab exercises slowly at first. Imbed some training in your standing at school. Find some easily accomplished exercise and add it to your day. Ice after your work. Try the stockings Brigitte mentioned as they are supposed to help circulation. Don't try everything at once. Ice no matter what. The stockings if you want. Add something else for a few days and see how you feel. Not as good as you like drop it and try something else. Always stretch and make time for the rehab basics and a walk. See if any of this makes any sense for you. Keep me posted on how you're doing.