Right click on mouse in game didn't work. HELP.

I've been playing all day normal, but then when I entered an aaram game as Zed, my right mouse click wasn't working at all. I couldn't move or click anything to auto attack but I could buy in shop. At the last minute literally I found out I could walk around using a key but it was way too hard. I'm not sure if this is a bug but the right click doesn't work in Summoner's rift either. (it is not the mouse because it is working completely fine outside the game) Please help. - Paola