I can totally relate to your post morethan2. In my case it's a loss of confidence issue. As Jalima and others suggested fill the form out in pencil first I also tackle what I consider difficult issues by doing it step by step 'salami slicing'. Regarding form filling - do a couple of pages a day if it is a long form.
The satisfaction you get by completing a task helps with rebuilding your confidence.
Best wishes.
Angela Rayner lashes out and calls Sunak “pint sized loser”.