I'm ashamed, but today i wish my son didnt have ADHD

I feel so ashamed, i am crying. My son is brilliant, fantastic, clever, ambitious......and a ball of energy i need to handle in the right way. Im exhausted, im running on empty. 

Inbetween a full-time career, solo parenting 4/5days of the week and remembering everything, i cant cope. Im full of anxiety and back on medication. 

Today one has been a 13hour day with my son. 7am to 8pm and he still isnt asleep. We have played darts, basketball, devised a garden activity course, played footbal, watched TV, ive cooked, cleaned, washed, gardened. He answers me back at every turn if i get the slightest word wrong, because in his mind, i am simply not correct. Not factual and it must be rectified. Had i known my ex had ADHD before i married him, im not sure i would have. Its just too much energy, correction, ticks, constant need for attention, and RSD if i pull my son up on certain behaviour (its then a 15minute monologue of how stupid and bad he is if i tell him to stop answering me back). Today i just hate ADHD and my life. 

Had i known divorce was even more lonely and tiresome than marriage, i wouldnt have done it. He had lots of good points and i would have put up with it all! My ex has, what i feel, abandoned me. I have a far more demanding job. He does 2nights per week. And 2 days per week he pops round for 2hours. I do everything else. I dont know how much longer i can cope with this.