You will not get alimony cause you work and you are not a displaced homemaker or stay at home mother. It is unusual for an attorney to say you won't get anything or most claim you will get everything and drain you or your money and slowly you find out you aren't getting anything but large atty fees.
How come there are no assets when you both made good salaries. No bank accounts? Property?
Do a bit of checking and see what has been hidden as that's too much money not to have some assets somewhere. Any assets would yield you a portion. If he has been putting large amount into a retirement than you may very likely be entitle to part of it or he might have to cash it in and give you some. Do your homework and check things out. You might have yo get an atty to aupoena his finacial records and let him explain where his money went.
Why changed jobs making half the money you currently make? It will not help you.
As for SS, when you retire, you will have the choice of collecting on yours or his.
Your figures or this post and under gen'l divorce don't agree. On that you said he is capable of making 90,ooo cause he did 8-9 years ago but more recently 120,000.00 here you say 50,000. You need to get your facts straight.
It is the amoumt reported to the IRS not base pay etc.
The best revenge is to go on with your life, enjoy it and not look back. No kids--you can live fine on 40,000 a year with no bills.
If he already has a girlfriend, you can hang on and not sign but he will get the divorce with or without your consent. It is possible that you can get him to agree to give you something but sounds like his assts are hidden but they are there.