Hi Ja
I'm sorry that you find yourself in this position. I'm afraid that we are unable to offer you advice in this matter.
You can only appeal their decision not to allow you to take your case to the Upper Tribunal if you can find they made an "error in the law"
I have attached a link to the government website that explains your choices. The best thing to do is to speak to Citizens' Advice Bureau or a specialist welfare advisor.
commonslibrary.parliament.uk/research-briefings/CBP-10742/ BIS