If any of these jag off companies (and they are all terrible) put you on a plan, then you just need to move on and find another job.
Your manager clearly does not have your back in these situations. These companies are all dysfunctional pieces of garbage.
You have to learn this in life and learn it fast: Use these companies like they use you. Don't work too hard. In fact, barely work as much as possible and take their money (especially companies that are still putting employees on plans).
Finally, when you look for another job in this situation, you are holding the cards because your are more marketable to others. So, use that to your advantage NOW.
Also, go on short term disability if you need to buy time.
And one more thing, the next company you work for will appreciate you and you will have a manager that hired you, that probably likes you. So, you are starting fresh.
All these companies in Corporate America are terrible. There are no exceptions. Remember that, and you will be better off. Just get used to spending less money in life, and find retirement as soon as you can, and possibly a less stressful job. They are out there. These lesser paying jobs are better than the stress you will endure working for these terrible companies. You will live longer as well. Stress is a killer.
Good luck and keep us posted. Lots of smart people on here that can help.
I wish you the best.