pip review

Hi all, im new on here so hope im doing it right as have no clue, i have just recieved my pip review form, any help with it can be appreciated, I have ASD with traits of aspergers , where as in the north east i am finding it very hard to find any independant support (other than family) and cant attend groups due to not being able to be around people.
Secondly i am going through the process with my gp to find out why i am having breathing difficulties, asthma has been outruled and its looking likely to be copd but not confirmed. since my initial claim where atos lied about doing a home visit three times during the tribunal and admitting eventually they hadnt.
fair enough my medication list has multiplied for both illnesses, but my worry is i dont have any current (within 2 years) backup paperwork that i can forward with the review form.
im at my wits end and unsure what to do as far as the form is concerned