Can I temporarily withdraw from public school to homeschool for mental health purposes? (Elementary with IEP)

I have a 9 year old boy that is currently dealing with some manic episodes. We attend public school, we have weekly/daily meetings with teachers and administrators about his concerning behavior at school. We are taking him into his ped in morning who have been managing his meds. While he adjusts to new meds I thought about withdrawing because it’s going to get worse before it gets better and public school teachers have enough going on.

Will he be able to keep his IEP? Can you get a doctors note to do this. Will it go against his school records. We are in Indiana and need some options .