Hi Jackie 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 that this is such an ordeal for you

If you cannot get the ESA50 finished in time you should submit the partially completed form, with a note saying that you will send the rest of the information as soon as you are able, rather than wait until you have finished.
If you have further questions or comments about your ESA claim as the process goes on, please reply to this message and we will do our best to help. It makes our life so much easier if everything relating to one subject is kept in one place. You will find it easily in future if you bookmark/favourite it now on your web browser. Thank you in advance for your cooperation in this matter