Go old school? Every time you get mad, write the following 50 times. If fifty times doesn't do it, try 100.
Playing with a rating helps me to get an even match. When evenly matched, I should win/ lose games fairly equally. Since this makes sense, it is pointless to get really mad when I lose. I will do my best to get my feelings under control since getting mad is of no help.
Best wishes
I get really mad when I lose and can't do anything, every loss makes me want to quit chess not even talking about loss streaks.