Can i vent?

So, today was my rehearsal, the day before my wedding. It really didn't start out great. My friends stayed over in order to not sleep in as my rehearsal was at 11. The two of them ended up staying up till 7am drinking and watching tv... so when we tried to wake them up when it was time to leave and get ready, they were in a dead sleep. We went there without them, but my grooms parents were also an hour behind. We called them on our way as it take us 30 minutes to get there from where we live.... they said they JUST left their place which is an hour and a half away.... so going into the venue it was just us and we had to let them know our best man my only bridesmaid couldn't make it(our friends that stayed over) His one groomsman and brother showed up shortly after too. Eventually my maid of honor showed up, who is my sister, with her fiancé and my other sister. We showed them the tour and as we were all reminiscing and laughing, i got a call from an unknown number but it was from my city and state so i answered, it was my brother telling me that he wasn't going to be able to make it to my wedding the next day because he admitted himself into rehab. I tried to be ok so he wouldn't hear how upset i was but he did, i was crying and grieving, i guess and i ended up cutting the convo short cause i was at the venue in-front of a lot of people. Part of me feels like garbage cause i didn't talk to him longer, the other part of me is soo selfishly upset because my mom passed away years ago and i dont need one more person who should be there to miss it.
We spent the last few hours With my fiancée huge family and it hit hard towards the end.