Do you realise that the people there try to trip you up and make you say something wrong so they can refuse to allow you to have benefits? Its disgusting.
They basically asked my friend if she would be able to lift an empty cardboard box if it was in front of her.
Then they asked her if she phoned the job centre herself to get this interview. If so, she obviously has the dexterity to press the right buttons on the phone to call the right number...and did she get someone else to talk to the advisor on the phone for her? No, so you spoke yourself then? That means that not only do your hands and fingers work properly, but you obviously don't have any social anxiety either.
In which case, there are plenty of jobs you can do. You are not incapacitated, you are fit to work.
When can you expect yours?