im at a loss with my 7yos behavior

for context (if it even matters) my 7yo son has adhd and odd, and is currently in behavioral therapy. my son hit his teacher today, something that has never happened and i never expected to happen. he has a smart mouth, doesn't respect me or any other adult. he can be a sweet, very smart boy but under all that is a boy filled with disrespect and rage. i have no idea what else to do. the therapy doesn't work, we've been attending for 6-7 months. im losing my mind. i try disciplining him, taking privileges away, etc. he walks all over me, im a single parent so no father in the home which could contribute to the bad behavior (idk) i feel locked in a box with him. im scared for the adult he will turn out to be. i don't know what else to do. he treats me like some dude on the street, not as a parental figure. i see other kids his age act like normal well disciplined kids, and it makes me extremely sad because i just wish he could be a good kid, i wish i could enjoy him, but he makes me hate parenting.