moh Horror Story

My cousin and her fiancee have been planning the wedding for about a year now. It is a gay wedding. As the family is extremely happy for them, I however am about to blow up on the bridesmaids and brides.
First, my cousin was my MOH for my wedding. She stood by me for my big day. She always has. So when her MOH backed out I was more than happy to do this for her. I was under the impression that it was going to be a potluck wedding. Small venue nothing fancy. This was the 'idea'. The other MOH for my cousins fiancee was supposed to help plan the bachelorette party & bridal shower. I never once received a reply back. The other two bridesmaids, didn't communicate at all either. Eventually gave up, in my defense I really tried to get the two brides out for fun but it blew up in my face. Now the wedding is this week and I found out that they weren't planning on getting any food or drinks for the reception. All they did was tell the guests it was a potluck and everyone is bringing something. Right? Of course this just blew up in my face. Bride calls me freaking out asking for help because what our ONE family member is bringing isn't enough food and they can't afford it. So now I have to pay for EVERYTHING!!!!!!!!!!! The bridesmaids and other MOH aren't responding to any type of communication. So I called my Aunt and we're making it work. But still. They should of had it planned and worked out in detail by now. Now I'M working out the timeline and details of the wedding rehearsal and wedding day. On top of all the food prep I have to stay the night and help her get ready, do her hair, and makeup (which she had told me was taken care of). Am I wrong to think that this isn't fair? I feel like I'm planning my wedding all over again. Also I should point out I was in the hospital for two weeks right after they asked me to be my cousins MOH. My car was involved in a hit and run that I have to pay for because I couldn't get the drivers information and I need surgery.