I suffer sensory overload several times a day. I didn't know what it was until recently so knowing came as a sort of relief in its self. The only way I've ever found to deal with it is to isolate myself in a room, turn out the lights and stim to my hearts content until it calms down.

If I can't do this, then it usually leads to a 'meltdown' where I just feel like the world is about to crash in on top of me and I start really panicking, I lose the ability to speak and if people come near me I freak out completely, hit things, run away etc. My family and friends used to think I had anger issues, turns out I don't, it's because the sensory overload causes our flight or flight responses to become hyper stimulated.

Like I say, half the battle is knowing what you're dealing with. I'd highly recommend reading this blog article, I found it very informative and it helps to identify the warning signs of overload and how best to deal with them.

Part 1
Part 2
Part 3