Infinite potion effect glitch/bug

I don't remember how, but at some point I had poison for 2 seconds(0:02) and blindness for 2 seconds(0:02).
I tried to get rid of them by drinking milk. Then I tried to get rid of them by doing /effect

{player}

clear. After that I tried to kill myself, but the effects were still there. I have no idea what to do besides deleting the world.

It actually affects 1.7.10 but there is no option for that.