Can't take it anymore

This is my first time on here, looking for some sort of help or Outlet I don't know. I have a 15 year old he was diagnosed with ADHD and ODD back when he was 11 or 12. Though some therapists, which we have seen many have helped with a few things here and there, Things seem to be escalating and getting worse, my home is chaos fighting everyday, cussing screaming destroying doors walls. He was an A,B student his whole school career and now he's failing 3 classes and says he does not care he is giving up. We can barely get him to go to school he is missed so many days, of course there's always an excuse that he doesn't feel well or something hurts. His brother and he have a horrible relationship they haven't really spoken in 2 months, he has issues with his father because his father was military and was gone a lot. I cry almost every day I can't take this anymore and don't know what to do who to turn to where to go I keep looking for a therapist or somebody who's an expert in this area to help us but finding nothing.