Unfortunately, this looks to me like an aggravated felony. You really only have four options:
1) Get a full and unconditional governor's or U.S. Presidential pardon for the crime.
2) Hire a VERY good criminal attorney to look into the possibility of reopening your criminal case because something was done incorrectly at the criminal level. If the case can be reopened, then the conviction needs to be vacated (set aside) and then you would need an agreement from the prosecutor not to prosecute you again (which they can do). You can try looking for an attorney at www.ailalawyer.com.
3) Convince the majority of the U.S. Congress to change the law or to make a law of special application only for you called a Private Bill.
These options essentially would eliminate the conviction so that Immigration cannot use it against you to deport you. Unfortunately, sealing or expunging the conviction does not work.
4) IF you became a U.S. Lawful Permanent Resident while inside the U.S. AND you have a U.S. Citizen or U.S. Lawful Permanent Resident spouse or son or daughter that would suffer EXTREME HARDSHIP if you are deported, then you MIGHT stand a chance to not be deported and get Residency again.
I am truly sorry, but you have a tough battle ahead of you. Please let me know if you have any additional questions. I would be happy to answer them for you without additional charge, if not, please do not forget to click ACCEPT. That is the only way that I can get paid a small percentage of your deposit. If you do not click accept, the website gets all of your deposit and I get nothing. When you click accept, you are not charged again and we can continue to communicate without additional charge if you have a few follow-up questions. If you would like to request me in the future, just put my name on the subject line. Positive feedback for my service to you (not the state of the law as it is) is always appreciated as well as any bonus if you think I deserve it. Thank you.