It's a good friend's birthday today, it's a big birthday if that's relevant. There is supposed to be 10+ of us (I only know about 4 of these people, they are friends of my friend who I've met before but don't really know) going for a meal about a half hour drive out of our town. It's at a lovely hotel but I don't like anything on the menu, I have no disposable income and was borrowing money from DM to go. I have quite bad IBS and had a flare up a few days ago, I am still in some pain and still not 100%, I don't drive so would be relying on someone else to take me there and back so obviously felt it was unfair for me to ask if someone can take me home early if I didn't feel well. Anyway I thought all these things together it would be best if I didn't go, her other 'better' friends were a all still going so i messaged friend to say I wasn't feeling great and would she mind if I didn't come, she replied saying ok but now I feel really unreasonable, so aibu? Should I have made the effort and 'risked' feeling unwell and being unable to go home?