OP, I was in a terrible state 4-5 years ago. I've always been an anxious, highly strung person, and the peri/menopause just loaded it up full whack.
I couldn't get on a plane, or drive my car down the motorway, or sit anywhere for long periods of time without wanting to fight or flight. Usually flight.
I remember being on a lovely holiday and just sitting there really depressed and thinking everyone was better off without me. I also had horrible, intrusive thoughts. My marriage came very close to ending. My DH gets up at 5am, and I would be at the door of the shower telling him he didn't care about me, did he love me? If he went away, or stayed out late, or went to a conference with a female workmate, I would accuse him of having an affair. It was awful. I remember being in a hairdressers with loads of foils on, and I had a massive panic attack (being kept in the chair unable to leave) and I had to ask if I could go out the back to call my DH to calm me down. I managed to stay till they washed it all off, and I left and have never been back. I have a local hairdresser now, and for a couple of years I had to pop 2 propranolol just to be able to sit there whilst she touched up my roots. I still have to use propranolol to get on a flight otherwise I might jump up and run off.
I also had flooding, periods every 2 weeks. It was a nightmare.
I had HRT and a coil about 4 years ago. I've since dropped the HRT as it was the coil that sorted me out. It basically stopped my cycle. I don't know what is going on, as I haven't had a proper period for 4 years due to the coil. I am arranging a well woman checkup for the new year, and I may get some HRT and renew my coil. I think little things are creeping up on me again, mostly I have been kicking off and been angry apparently.
In the past I have been told that I am a nurturing person and that I did a good job with my DC and I take good care of my DH. I recently decided that if I am good at that, then I need to use those skills on myself. That is what I am doing now.
The best piece of advice I was ever given was from my late mum, who said "when you are stuck in a situation, do small things to prepare for when the door opens, and you can move swiftly". So, it may look like there is no way out of this, but there is. This too will pass. Do small things to help yourself everyday, even if you don't feel like it. It will collectively help massively.
We are here to help you OP. Tell us some of the things you like to do, what hobbies would you like to take up. Do you have family, any DC? What exercise do you like doing?