I stopped spousal support when my ex was unemployeed. Its been a few years and now I am unemployed and he is stable. Can I start the alimony back up?

When you agreed to stop your ex from making payments to you, did you do this informally between both of you or formally with a stipulation and order filed and approved by the court? If formal, was lamguagecused that maintenance was "held open" to you? If so, and  there is a substantial change of circumstances, the answer to your question is yes, you are  within your rights to take him back to court and ask for support.       If you did this informally, and didn't submit a formal agreement to the court, arguably you could try to collect on the arrears built up from the non payments of support and could file a contempt motion to enforce the original terms of the agreement.