I'm really sorry to hear what you are going through. Please know I'm sending you a big virtual hug.
I've gone through something similar (although not to the extent you have), and it's tough. You give a lot to an organisation and they don't have your back. You're just a number and a problem that they don't want to deal with. That was the hardest bit for me, it was a gut punch and I realised that HR wasn't there to protect me, they protect the organisation. And it's devastating.
I'm also going through a claims process and it's been going since May...they make it hard every step of the way. I've recently engaged a lawyer (no win, no fee - but a reputable one, not a small time one) to take the pressure and anxiety off me. That's really helped me. I'm not sure if that is something you'd like to consider, but it has really reduced my anxiety.
Additionally.... I hear you re the one income. My medical team has advised me not to work for at least another year. And it is something I struggle with. I've gone from a really good salary to receiving centrelink, and it can feel disheartening. I find it uncomfortable having to rely on my partner for things,but the best way through is communicating and setting up a budget.
It's understandable that all these things are fuelling your anxiety. Have you spoken to your psych about this? Have you considered going on medication to help ease the anxiety? I know sertraline is safe for during pregnancy (if you are or if you plan to in future).
It sounds like you are feeling like you are losing control of things, so you're using exercise as a coping strategy (something you can control). I know for me, when I've had periods of anxiety, I've used food restriction as a coping mechanism. It's a safety behaviour - unfortunately, extreme exercise is not a healthy safety behaviour...can you try and set yourself a limit for each day?
I've posted a link here that will take you to some good resources on anxiety and worry and rumination - I've used these resources myself: https://www.cci.health.wa.gov.au/Resources/Looking-After-Yourself
Take a deep breath. You will get another job. But right now, you need to focus on you and heal from what was a traumatic experience.
Re the pregnancy test - either way, it will not the end of the world and there are options. But the best thing is to have your partner there with you, so you have the support you need for the result.
I know it feels hard. But you can get through this.