I think it should be your mental state or environmental influence. Have a good rest at night? Did you pay attention when you exercised? Is your subconscious positive? Whenever we push a heavy object in training, we should subconsciously cheer ourselves up and encourage ourselves to push. Also, when exercising, you should have a plan and estimate how much weight you can do several times. Don't force yourself to do the same weight and times as others. What you said is not very clear. I can't comment on nutrition and your previous exercise. I hope you can put your mind right, but lower your weight, slowly call back your passion for sports and get out of the doldrums as soon as possible.