UC50 - Hospital Admission in Last 12 months - What Effect Does This Have?

I am presently filling in a UC50. It asks if you were admitted to hospital for more than 28 days within last 12 months. I was admitted with breathing problems on 29th May - 12th July. Spent 20 days in ITU on a ventilator. I had a fungal lung infection and interstitual Lung Disease related to rheumatoid arthritis. Have a number of other conditions, the RA affects everything. I have had breathing problems causing nasty difficulties for 3 years, had CT scans but couldn't get respiratory to see me, no matter what I or my GP said. Then a year later I was ventilated in ITU not expected to survive, being considered for a long term tracheostomy (although this wasn't needed in the end thank goodness). Support from the respiratory team has been totally absent since discharge although I do have a discharge notice saying ILD was diagnosed.

1) wondering what effect the hospital admission has on my capability for work? I have been told by ITU it can take 18 months to recover. My brain has been affected (short term memory, mood - I had delusions due to the sedation), fatigue that I had before is worse, mobility is worse (I fall quite a bit, couldn't even walk more than a few steps at first, can do more now but not as much as I could do pre admission. But not sure how to explain all this as not sure how it will be used.

2) It has taken some time to get appts with Diabetes care, RA care, and respiratory follow up (a wonderful telephone appt only). So any letters for evidence won't arrive before UC50 needs to be returned. I gather I can send these separately when I get them. I can send old letters from RA. GP and NHS services are a bit broken so no idea when I will get up to date letters. So should have evidence for things that have really happened but may not get it in time before UC50 form is assessed. Can I do anything about this?