I have three payments behind on a repo from Credit Acceptance what shall I do now

YOur use of the word "repo" in your post gives me the impression you no longer have possession of the car, as it has since been repossessed. Being that you're three months behind, it's a possibility either way. Whereas were you six months behind, I could pretty much figure with 99% accuracy the car was repossessed already. So do you still have possession of the car? 

What's your income situation?
What's the details of your outstanding debt situation? 

Here's the four things that matter for every living human, in the order of importance.

1) Food

2) Shelter

3) Clothing

4) Transportation

In your situation, anything after 4) doesn't matter. So you can cut up the credit cards since you won't be paying them at this time regardless of what the outstanding balance may be. If you're three or more payments behind on the car, then forget about "saving" your credit.  Captain EJ Smith couldn't save the Titanic in Apr 1912, and you can't either in 2019. But you'll be able to "raise your Titanic" later. Your need for transportation is not something you play with. No transportation, no way to get to work and make money to take care of those four basic needs first.  Couple of rules here you need to follow.

1) You're on rice and beans, beans and rice. No more eating out. The only way you see the inside of a restaurant is if you work there. 

2) If not buying something means you will not die, then you don't buy it. Period.

3) Time for a garage or yard sale. If you don't need it, sell it and use the money to catch the car up. Basically, what's more important to you? That 52 inch widescreen theater TV? Or a way to get to work and make money? Sell the home theater. 

4) If married, do you "really" need two cars? While it may cause inconvenience, I doubt you "need" two cars. Sell one. 
5) If married with kids and one spouse is a "stay at home" with the kids type, they can care for more than your kids at home and get paid for it. Time to look into the requirements for opening an in-home daycare. Even if only short term.