I can soooooo sympathise and understand completely absolutely how you feel. {{{hugs}}}
My first son is ADHD, he is currently about to have his 16th birthday... and i can honestly say that somedays i wondered if either of us would reach this point...
At the age of 7 there was one particular night that i wondered how i didnt do him some permanent damage. I had absolutely had enough and truly felt like shoving his head through a wall ( and ), i didnt as it happens I screamed some unintelligble nonsense at him as i was too angry for words, slammed the door and went outside and cried... a lot. So, trust me, you and me are not the only ones who have got to that point.
As a baby he was incredibly easy and laid back about everything, feeding him was a nightmare tho as he just used to kinda 'forget' what he was doing. By 2 i remember saying to the HV "omg, he has the attention span of a goldfish!" in complete exasperation as even at that point he couldnt even 'play' with baby toys before losing interest and fiddling with other stuff. At that point she mentioned ADHD, i didnt beleive her...
It took over 5yrs to get a DX.
To cut a long story short, I took him out of school at 10yrs, and home-educated him (and it was really HARD!) but i really think it worked out for the best. But its not for everyone. He is now 15 and the most helpful, enthusiastic 15y/o i know. He has a growing sense of humour and a willingness to learn. hes still impulsive and still a little thoughtless (but he would be - hes ADHD!). But he really is a pleasure to be with, and hes got immaculate manners!
I know the future you see looks bleak at the moment - but he will come out of it, and you will both be closer because of all you have both been through.
The girls on here are lovely, and will always have some good advice and a shoulder for you. Be kind to yourself (dont go beating yourself up about anything, its a real hard job and you reallly are doing great!) grab help where you can, and remember what hes going through is NOT PERSONAL to you, he is not launching an attack on you personally, its unfortunate that you are in the firing line. if this behaviour is coming out - how does he feel on the inside??? {{{hugs}}} for your journey. and hope for your future. XXX