Just need to rant

My daughter had a doctors appointment today. The doctor was concerned that she isn't gaining enough weight, she's in the 1st percentile. The doc suggested we continue to do what we've been doing and check back in a month. If her weight goes down or stays so low she Wil refer us to peds and said they may admit my daughter and giving her a feeding tube. That is the worst case scenario, my husband did not like the idea of waiting one more month and wanted to fly out to Toronto to get a second opinion from sick kids hospital. He wanted to fly or drive, it's a 17 hour drive which is brutal with a newborn and a toddler so I looked for some flights. I found and booked the flight we went to the airport and as we are checking in the attendant tells us the flight is booked for apr 12 not today feb 12. I guess when I went onto the airline website they changed the dates and I didn't notice. I fucked up, the tickets were $500 and our booked accommodation was another $500. I apologized for not double checking the date owned up to my mistake and he was just silent didn't say a word. Left me in the airport with two crying babies to go get the car. Didn't say anything the drive back home. After we got home he said I'll be back and left. 2 hours later I messaged him asking where he went and he said 'out' I aksed when he plans to come back and he isn't responding. I know I messed up but fuck. I had a really hard day my toddler skipped a nap and was crying and fussing the whole afternoon I went to the doctor with both kids by myself was so overwhelmed by the news the doctor gave me and my cranky toddler. Than I had to pack the bag book the tickets and accommodations while he did nothing and he has the audacity to react this way. And it's not even the money hed be pissed about since he spends thousands a week on his phone games and the casino. I'm just fuming right now. I can't put my baby to bed since he has the basinet in the car my toddler won't sleep he's asking for daddy and it was a simple mistake.