So, there's a lot going on here.
First, I can only reply based on what you've posted--so I don't know what you have in you, as far as mental energy to fight this. I know that many of us, in addition to raising children with significant disabilities, have other challenges at work, with our aging parents and so on.
But--here are your options and some stuff to read.
1. Sounds like your FBA was just complete garbage. You gave the school a chance to get it right, and they didn't, so you may want to consider an IEE.
https://adayinourshoes.com/school-fba-behavior-plan/
https://adayinourshoes.com/iee-independent-education-evaluation/
2. No, you do not need to wait until the ARD or annual review date for evaluations. A parent can request evaluations or changes to an IEP at any time. If they refuse you your request, they are required to provide you with a PWN.
https://adayinourshoes.com/iep-prior-written-notice-pwn/
3. Homeschooling is always an option. Weigh all the pros and cons.
https://adayinourshoes.com/pros-cons-homeschooling-iep/
https://adayinourshoes.com/best-homeschool-curriculums-for-adhd-and-autism/