I'd hide in the toilets or the coat room after the meetings to avoid be accosted by people after the meetings. I hated that fact that Witnesses had absolutely zero sense of personal boundries! I would be petting and stroked like a damn animal, which was especially difficult for me because I hate anyone that isn't my close family or friends to touch me - at all!
At the local assembly, about 3 years leading up to me finally leaving, I would get really distressed and panicy having to listen to talk after talk, so I stopped sitting in the main hall and would sit by myself in the back of the cafe. But that didn't work well because every 15 minutes someone would feel the need to come over and try to 'comfort me' and convince me to come sit with them and I'd have to keep making up excuses.
In the end I just got in the habit of bringing a thick, fluffy coat with me to assemblies. I'd lock myself in one of the upstairs toilets, fold my coat up and go to sleep leaning against the wall for the duration.