Can't login to servers and can;t remember my login info

So a few months ago, it couldn't remember my username and password even though the remember me is on. Today, i had the same exact problem that i had MONTHS ago, and now i couldn't log into ANY server. it always says ' Failed to login; Invalid Session ( Try restarting your game ) for 10 times. I redownloaded minecraft 20 times and tried to fix it 13 times. I tried all the methods in youtube but NOTHING. Please Help this probl