I've been away for awhile and was shocked when I read this. As a fellow Mainer I was truly saddened with the news.
I don't know but, you did stop after the initial rush of adrenalin,(the fight or flight drug), so you did not resist, IMO. Since you stopped instead of them having to jump on you I think the treatment you got from them was overly aggressive and should be brought up. Seems to me all they had to do was tell you to put your hands behind your back. Did you have any bruising? If so, I would take pics of it.
I would definitely push the medical need and personally, I would express the unfairness of having to register and having your personal information out there. That isn't what the people voted for when the law was put into effect and the state never had that kind of control over the hard drugs like Oxy.
Sounds to me like the drunken **** was jealous of your family life and retaliated because of it. I hope everything goes well for you and your family my friend.