I heard about the clapping game. I thought this was funny, you need to be brave though. Start clapping for something that they wouldn't normally clap for, and see if the rest of the cong follow, or a little easier is to keep the clapping going when it starts to fade off, keep going as long as you can, get some friends to join in and do it at assemblies too.
This is a really childish and silly game. The reality of your situation is that it is making you feel sick. This is common, listen to your body, you don't want to make yourself ill. I was at meetings, feeling sick doing what I had to do for family, but it was too much. I had to leave, I couldn't keep up the facade.
Do what you gotta do to look after your health
Kate xx