TIFU by inadvertently getting my boss fired, making life even worse and now maybe getting fired myself

I worked for my employer for about 10 years before my then new boss joined. She had energy and was quite inspiring. Before she came it wasn’t well run and I hadn’t had many opportunities. She came and made some changes and improved how things ran and promoted me into this job. She helped me develop more than anyone else had and I got more confident in my role. She was a great sounding board for me and let me vent when things got bad. Things were really good for a while and our performance improved.

Performance was impacted by the pandemic, lots of people went off sick and there were other difficulties. It became harder. Then my boss got covid and it took a long time for her to get over it. She was still in work but tired and everything seemed harder and performance was slipping. I still vented at her but she didn’t seem to have the energy to listen and I felt unsupported.

One day her boss spoke to me after one of these meetings and I vented to him instead. He asked me about my boss and I told him honestly. I suppose I thought he’d get involved and somehow help get things back to how they were.

He did get involved - by firing her, using my feedback. She’ll have known it was me. I haven’t seen her or contacted her since as we were told not to. I feel too guilty anyway.

It hasn’t got better, it’s now worse and I’m really stressed.

Her boss became my boss while they looked for a replacement. Until I worked for him, I thought he was a good boss, I don’t now.

He hardly spoke to me, just sent emails with demands for more work or more commonly complaints about issues and I realised how much my former boss must have been shielding from me. He never let me bounce ideas of him or vent or even raise a problem unless I had a solution.

A replacement was found but he wasn’t any better and constantly finds fault with me. To be honest, now I’m not surprised. I don’t think I’m doing a good job anymore.

Anyway I’ve just been put on an improvement plan so assume they’re trying to get rid of me too. The way I feel, I’d be happy except that I can’t afford to leave and I haven’t seen any other similar jobs paying what I get.

TL;DR I got rid of my boss to make my life better but instead made it worse and now might also be fired and only myself to blame.