RE: Historical records-hospital admissions letters

Hello! I am submitting my application for PIP for migration from a lifetime award of DLA.

I am wondering how relevant you might think it will be for me to submit letters detailing my hospital admittances, probation letters (danger to others) and letters detailing my being let go from a job due to my hospital admission for bipolar from the 1970s?
Some detail my erratic behaviour and difficulties which continue to this day such as issues with sleep patterns etc.

Should I mention how many short term jobs I have had previously? Might letters from within the first 10 years from I was diagnosed in 1969 be taken into consideration? (I received these documents following the death of my Mother in 1998). I am over 65 but born in 1949.

Thank you