I'm sorry that you're going through this, it cannot be easy.
My advice is not to agree to any demands until you have an informed opinion on where you stand legally, you need correct legal advice specific to your own situation.
Once you have this I would also urge you to take your time to think about what is best for you and your family. Do not be rushed into any decision lightly or quickly by anyone, stand firm and hold your ground. This may be easier said than done but it may help you in the long run. Often we make hasty decisions and then regret them.
From a legal standpoint, if you were to return to the UK there is no legal agreement between the UK and the UAE for the UK authorities i.e. the CSA to force your husband to pay any maintenance. Therefore if he remains in the UAE and you do not then you may end up with nothing. I am not sure on how this would work if you were to both remain in the UAE and divorce.
If you were to go ahead with a divorce then you stand a better chance of a fairer divorce deal if you were to divorce in the UK. It sounds harsh but that is the reality.
I hope you get through this one way or another but remember, find out legally where you stand and don't be rushed by him or anyone.
Good luck and big hugs :)