Hi Penny and Welcome to the forum, you might want to have a look at the following FAQ which explain where everything is
Welcome to Benefits and Work I'm sorry this is worrying you so much
I suggest you have a good look at our PIP guide as this explains in detail the criteria against which you are being assessed and also what to expect at the assessment.
PIP help for claimants May I suggest that you bookmark/favourite this on your web browser now so that you can find it easily in future? This will allow you to return with further questions or comments about your PIP without having to start a new topic each time. It helps us enormously when everything relating to the same claim is kept in one topic - and I hope you will find it useful too