Downswings are part of the game, but i think u tillt easy, and go for bigger buyins trying to finish with a profit at the end of the day, but u actually go even deeper in the hole, so i would say to better stand the swings, do some of this things:
1. Take a brake, 1-2 days even more if u have to, to try to turn your luck and to avoid burning out.
2. Always play with a small amount of your bankroll, i would recommend 1/10, and always keep to the plan, if u lose that 1 of 10th, shut down your PC of if u play live, stand up and go home, u can only do worse from there on.
3. Good and strict bankroll management.