@marbowl Please do not be ashamed to admit that you have discontinued your exercises. You have plenty on your plate as it is and are to be admired to be working in the situation you are in.

As others have said, the knee exercises are primarily to strengthen, so not doing them will cause a lag in that, plus you may possibly not achieve the flex you would be able to if you were able to continue them. Your pain is simply from being on your feet so much. I hope this situation improves soon and you will able to resume your normal activities.
JK