So, my best friend is getting married in 10 months. Let's call her Becky. I'm her maid of honor. Its exciting and I'm really happy for her. I've never been a maid of honor before though. I'm struggling with this situation so far:

So Becky has already picked out her dress and decided on bridesmaid dresses. We spent an entire day shopping in a city an hour away and deciding on these things. 

Since then, she has invited the other bridesmaids and I to go to 2 events with her. The first was a florist visit last month so she could decide on the kind of flowers she wanted for the wedding. I originally said yes I would go, but then she had to change the date of the appointment to a day where I had to work. So I didnt go. 

The second event was yesterday. 3 days prior she had told me and other bridesmaids about this bridal fair she wanted to go to, and asked if we could go. I told her I would have to see how things went because I worked that evening. The event would basically take most of my sleeping time. But whatever. 

Saturday night comes along and Becky and I both get invited out to a birthday party of a mutual friend that night. We both had off, and we would see some good friends which included the other bridesmaids, so we all went. Everyone got wasted, most people not making it home before vomiting. I had a good time, things felt good. At the party, Becky asked me again if I would go to the bridal fair the next morning. She begged, saying only a couple of other older family members were going with her. Drunk me felt like Superwoman, so I said sure. Everyone got drunk af and went home. 

I went home at 2am, woke up at 5am with a splitting headache and a shit ton of stomach pain. I took ibuprofen and tried to get comfortable enough to sleep. No go. I chugged water. Still felt like shit. Now its 8am and I am extremely nauseous. I hadn't drank alcohol since 1am, I thought I had escaped nausea. My boyfriend was really worried I had something else going on because of the amount of pain I was in, and wanted me to go to the hospital, but I'm in the medical field so I felt like I knew when I would need to go to the doctor. I couldnt sleep still. It was 9:30am. The bridal fair was supposed to be at 11. I texted Becky to tell her I wasnt going to be able to go. I felt like complete crap. I apologized. 

I finally vomited, passed gas, and the stomach pains/nausea started to fade. It was 11:30. Becky had opened my message but not responded. I finally was able to fall asleep. At 1pm I woke up to a message from Becky, saying she was extremely disappointed in the fact that I wasnt there for her with the wedding planning. She said I never went to events with her and she would just have to learn to "lean on" someone else instead of me. 

I'm like...what? I spent a day with her picking out dresses. I am actively planning an expensive bachelorette party because she wants a destination one. I feel like I'm doing what I'm supposed to do. It has just been shitty timing for the other stuff. I told Becky this, she said it doesnt change the fact that I've let her down and been a disappointment to her. She then went on to say she doesnt accept my reasons for not going to the bridal fair (extreme nausea and pain). She said every other bridesmaid had messaged her the same thing and she expected more. 

I just... I don't know. In my family, you did not have the maid of honor or bridesmaids do shit like this. They help with bachelorette parties and stuff like that. It's just weird to me that Becky seems to expect this much of me and the other bridesmaids. Is this normal though? Am I being an asshole? 

Tl;dr bride is mad that maid of honor and bridesmaids cant make it to florist meeting and bridal fair. AITA for not being there?