First, break down the practical stuff to what has to happen.
Passports probably first. These can be done online.
If you have pets, speak to some good pet shippers such as Dogtainers. This needs to be done early.
If you are moving really quick, you probably won't have the time to arrange to ship all your possessions. But, you will have time to arrange a MoveCube. These come in three sizes and you would be surprised what you can get in!
In which case, start thinking about what you will sell and doing so.
Start job hunting back in the UK.
Look at schools and speak to / contact the schools in the area you are hoping to move to.
Speak to property management agents about renting out your property. If you do decide to sell later, this can be done from the UK.
With regard health / medications, get a copy of medical records and take these with you. I take a number of medications and it wasn't an issue.
I know it seems daunting. But, we did it in less than a week from the position you are in now.