Sorry for bumping this old thread. I was going to start a new one but then I came across this old post.
It's mindboggling to see so many people having the exact same sensory overload symptoms as me! But to answer the question:
1. I get super quiet during overloads. No small talk, no eye contact, no pleasantries, no nothing. Just leave me alone!
2. Start snapping at people and get super cranky and mean.
3. Find it impossible to put on the 'mask'.
4. Start fidgeting and playing with keyrings, pens, phones etc. Whatever is in my hand.
5. In severe cases, I get a stress headache.
As for how I deal with it... well, I take beta-blockers (Atenolol), which my doctor originally prescribed for my heart tremors but I found the drug to be highly effective in dialing down my sensory overload.
I'm not sure how or why, exactly. It just seems to work, for some reason. I also Googled it a bit and from what I gather, beta-blockers in general and Propranolol in particular are indeed somewhat effective at controlling certain ASD symptoms.
Has anyone else tried beta-blockers or planning to?