Pip Tribunal help please

Rosie2023

When I filled in my pip form I included that I had osteoarthritis and how it affected me. At the time it was mostly in my wrists hands and feet and I detailed my struggles . I have now been told its in my spine lower part. Can I send this to the tribunal? Or will they see it as a new condition?

Similarly with depression I detailed my anxiety and depression on making journeys . My DR has recently diagnosed me as agoraphobic.  Again is this a new condition or can it be used for my tribunal?

Many thanks