Why are weddings stressful

Kathy
Omg I'm getting married in 3 weeks and my fiances side of the family is being difficult his mom refuses to help, his family is now like oh I don't know if we can make it like his sisters I'm like wtf, his family refuses to meet mine, ive put off like ordering things because his family will not give me a damn head count, I had to cancel my cake because I now need a smaller one, my anxiety is through the roof I'm literally so stressed out my so and I have gotten into some very heated arguments like screaming matches almost he throws things when he's mad mainly his phone, I'm literally having a mental breakdown and severe anxiety attacks which I haven't had in years that I've been placed on medication.