I'm really unhappy about this and don't know how to shake it off

[CatamaranViper]

I work for a lovely, small business. There's only a handful of us here but the future of the company is very unstable. Basically they are looking to close the business within the next 12 months (max). It's been a long time coming and definitely not a surprise. I was holding out to see it through to the end (was promised a very generous redundancy) but a few month ago, DH found out that his job was also in trouble.
We have a mortgage and a child and I'm the sort of person that needs stability (or at least some stability) so the thought of us both being out of work at the same time was terrifying.
I managed to find a job which I have accepted. It's more money, closer to home and better hours than my current job. On paper, it's ideal. I'm absolutely gutted though.
I don't want to leave my current job. I don't want to start this new job. I have all the usual pre-new-job fears, but I do have an overwhelming feeling that I don't want to leave. I've been happy in this role for years, I'm comfortable, I'm settled and I'm happy.
Logically I know that this job will end, probably in the next 12 months but could very easily be sooner. It was getting to the point where each week I was expecting to be given notice and I was a bit of a wreck about it.
I stumbled on this new job completely out of no where and have no idea how I've managed to land it. Everyone else is so happy for me. Even my current bosses are saying it's the right move and a brilliant opportunity.
I've burst into tears a few times about this and I'm feeling incredibly insecure and honestly, dread.

I know I need to be rational but I can't move past this feeling that it's all wrong. Does anyone have any advice on how to sort my head out?

Just to add. I do have anxiety which I take medication for, I'm tempted to ask for a higher dose while I try and overcome this.

Its completely understandable that you don't want to change jobs. I think time will resolve this. In the meantime you just have to keep on going, and accept that while you would rather stay where you are, it is not practical, and it is going to end soon regardless. Better go to the new job now, than end up looking in a panic and end up with something far worse.

Be kind to yourself OP. Moving job is a big step, and it sounds like you're emotionally attached to your current workplace and your workmates, so it's natural for you to be anxious about it. You just have to put one foot in front of the other, and remember that it may take time for you to settle in your new job, so don't expect to feel at home there straight away when you do go.

I think what you're experiencing is not necessarily to do with the new job, it's grief you're experiencing over the loss of your previous role and lovely colleagues, the end of an era.
It's horrible being made redundant when you would never have chosen to leave. It's a loss of control but you've taken back control by finding another job.

The same thing happened to a friend of mine who was made redundant after 15 years. She went from being a capable confident person to being stuck at home day after day with anxiety and depression, all sparked off by loss of her job. She eventually got another job and is very happy in it.
But she hung on to the bitter end, I suspect not really accepting redundancy was inevitable, and with hindsight she should have done what you've done and found another job to move directly into.

Congratulations on the new job. It's a tough job market at moment so you've done well.

Thank you.
I keep panicking about leaving. Worrying that I've somehow made a mistake. But it can't be a mistake, because this current job has an expiry date and it was really affecting my mental health.

I've been really spoiled in this job. Employers who really, really care about me and my family (they sent lovely gifts to DH when he went for a major operation) and have bent over backwards to give me a great work-life balance. I've not had to miss a single school thing for DS, they've put me through any training I've shown an interest in, they are shit hot on ethics and the office is lush too.
New place physically won't be as nice as this place, but I can't comment on the work-life balance yet. I just hope it's okay!