I have lost the same 3 to 5 pounds at least a million times!

Six months ago, I lost 20 pounds. I still have about 30 pounds to go but I am stalled. Each Monday through Thursday I lose 3 pounds and Friday to Sunday I gain it back. Each Monday, I wake up completely depressed that I have done this to myself again. I am on such a strict protocol Monday through Thursday and I think that this is half the problem that by Friday, I just can’t take it anymore and I completely derail and after I do it once, I say “oh well”, I will have to start again on Monday. Mondays are terrible. I beat myself up all day long. How can I do this to myself again? Was it really worth it? No wonder I am so fat. Mondays are exhausting. I want to get out of this cycle.