“There is a chance I might be going to jail. Can my ex get alimony payments stopped if I am imprisoned? There is no termination date on the alimony in the judgment, We’ve been married for over 30 years.”

Perhaps. While you are in stir, you certainly will not need support, being a ward of the state and all. Based on that change of circumstances, the court just might make an order terminating spousal support based on lack of current need. Get out quickly.