Does anyone else try avoid social situations?

So, my son is turning 9 soon and my mother and sister want to celebrate with the both of us Monday since both he and his cousin are off of school. I’ve been debating just sending my son so I don’t have to eat anything since they are planning pizza and cakes (ones a binge food and the other is a purge food, neither are “safe”). My son wants me to be there with him, which is understandable, but I really can’t figure out how I’m supposed to force myself to eat in front of them. I don’t even eat in front of my son anymore if I can help it because it’s uncomfortable. I also got asked to hang out with a friend I haven’t seen in months but usually when we hang out, there is food involved. We go out to eat and I end up either only getting a water (with disappointed looks) or feeling like a fat f*** over eating more than I feel like I should be since it’s not written on my meal plan. Then for days after restricting and/or over exercising to make sure I “even out” the days. It’s exhausting to keep track of and makes it not worth even trying. I’m just lost. I don’t know what to do with this all anymore. And with holidays coming up, that means more celebrations with food and I can’t see myself doing it at all.