Is it possible to change the employer and get my case re-open through new employer?

First off, you wouldn't have filed for H1B but the employer would have. Secondly, this sounds like conjecture. USCIS is required to make decisions...

Affidavit support fee

In order to keep the I-130 alive NVC needs you to contact them at least once a year about the case. Since you have apparently let a year pass by...

Was my cos field correctly?

Work with the attorney who filed this and ask him/her these questions. If you are still uncertain as to the answers or are considering changing...

What happend if a j1 is terminated while awating a change of status?

If COS was properly filed, unlawful presence begins to accrue upon denial of COS. Otherwise, unlawful presence begins to accrue at termination of J1.

So I have a biometrics with USCI comming up. I was in diversion will that show up?

You bet it will. Consider hiring an immigration attorney.

With this many questions and uncertainties you really need to meet directly with an immigration attorney who can go over a detailed analysis of...

Filing form I-485, what is the USCIS status expiration date?

You can just put "F1-D/S" (duration of status). Consider having an immigration lawyer look over your application before sending it. Good luck.

What forgiveness waiver do I need and is there any way I can come back temporarily during the immigration process for surgery?

You've made enough mistakes doing things on your own. Get an immigration attorney to help. Sounds like you have a strong waiver case. Don't mess it...

Do you think I might be able to come back to the U.S?

It is unclear what you mean by 'left everything in legal mood'. You may have more difficulties obtaining a visa now due to your criminal...

Working permit?

It sounds like you need a real immigration attorney and not some notario or caseworker to assist you with your case. Sometimes you unfortunately...