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I think you know the answer to your problem. You are pushing your knee beyond its capacity to function at this stage of your recovery. Clipless is right on target. You're going to have to slow down. That heat and swelling are the indicators that you're inflaming your soft tissues by being on your feet too much.
I suggest you take a really hard look at what you're doing with your job and find some accommodations for the remainder of the school year. They might be things like:
* Getting special parking so you park close to a door near your classroom
* Arranging for an assistant to help you in the classroom so you're not on your feet all day
* Getting a chair or stool to use at least part of the time in class
* Only doing assignments that are absolutely required...no extra concerts, lunchroom or study hall details or other things that could be assigned to someone who is not trying to recover from major surgery
* Find time to day to ice and elevate between classes or at lunch
* Ask students to run errands for you to the office or other places so you're not walking around as much during the day
* Go straight home after school to ice and elevate your knee ..... no errands or home chores on days you work
You get the idea. I know you're unhappy. Sometimes one knee is more difficult than the other. Yours is. If people at work don't understand, enlist your surgeon to write a list of permitted activities for your workday. Most are very happy to accommodate what you feel is the amount of activity you can tolerate.
I need to warn you that if you continue to push yourself and have this level of pain and swelling, you risk having the pain become chronic. You don't want this. Your health is so important.....please don't risk it.