What Does Swelling In The Legs Indicate?

I am disabled and my feet and legs have been swelling for three weeks now. I take two diuretics at bedtime, and one in the afternoon. It is aforesaid. I am living in an apartment building that has had bedbugs, and of course they took my bed, couch, and liftchair, so for three weeks I have been sitting in my power chair with my legs down to try and sleep. I have been bitten on top of both feet and toes, and my feet are very swollen. My Doctor is on maternity leave,so I don t know what to do. I can barely walk six feet without sitting down.