Not sure if this is the correct sub, apologies if not. I get anxious whenever my friends talk about stuff without me. Now I am talking friends that I have known for 5, even 10 years. But anytime there is an implication that they were chatting without me, I get this horrendous not in my stomach (it is as bad as before I step on a plane). This even happens when they were doing something nice for me. Most recently it was organising a surprise birthday for me. an objectively nice thing, and the only thought I had was, "they did it without me". Guess that I want to know is, why is this happening and what do I about it?