Lost my lower rate of Pip after an assessment

I resently had a DWP PIP assessment, were I’m told I didn’t now qualify for the lower rate of motobility. Even though I now have a new condition of gout. I originally qualify because I also have arthritis and spondylitis. It stated in the report that I declined to undertake the musculoskeletal assessment however I managed to rise from sitting without difficulty, which demonstrated adequate hip movement & walking to the assessment room using 1 stick. That didn’t take any significant amount of pain relief. It states that I managed these activities unaided & I can stand & then move more than 200 metres. How can that be determined from my slower than normal walk from the sitting area in a building to an assessment room on the same level in the same building not even 50 metres away. All the time I was then in the assessment room. I was in pain in my feet for one,I even apologise for having to take my shoes off because of this. Yet that wasn’t mentioned. I have morphine patches which release hourly. I take amitryptoline pain relief,co-codamol & also use capcacium pain relief cream. How much more do they assesses as being a significant amount of pain relief. O yes & I use ice packs as well to help with pain & swelling. The whole report is either a lie or at the very least not explained fully about my conditions & how they affect my ability to do things. Sorry for the lengthy message.