If you really get that upset every day you need to stop for a week or so and come back fresh. The first 2 years i played league i was a horrible rager, it's a miracle i didn't get banned. How did i stop you ask?
There comes a point in time where you need to decide if it's truly who you are as a person. If it's truly what/who you are as a person to rage, flame, troll and get angry every day of your life from things outside of your control. I decided that wasn't who i was and i have rectified my situation by probably 95%. Sometimes my teammates stupidity gets the better of me and i have to point it out to them, but it's 1/100 games. I'm sorry for that 1/100th game but nobodies perfect.
Another thing i do if i'm feeling a little frustrated is i vent about things towards no specific person, or just towards myself. I'll just say things like "Damn this lucian." or "i'm so upset i fed that caitlyn" or something to that effect.
Additionally, if you're having a bad day already, or a day that even just seems weird/off in some unknown way, DO NOT PLAY. I make this mistake SO OFTEN and last night i had a 1/100th game and i hate it.