Don't be (ashamed) at claiming benefits. You were medically retired on health grounds. Never mind the top ups from DWP to give you the basic income guarantee. You are probably 99.9% entitled to ESA (employment support allowance) and POP ( personal independence payment) and HB ( housing benefit). If you get any of the 3 main benefits above, you appeals quality for mortgage interest payments, and you would/ might qualify for other top ups depending if your married/ partners working, your single ect, but you having PARKINSON'S is most likely to get you PIP in your own right, even if you have a partner. Any pension money doesn't get taken into consideration against PIP. The ESA has 2 parts, INCOME AND CONTRIBUTIONS. It all depends on the last 2 years national insurance contributions, so years 2016/17 that you have paid and as you said you were getting top ups you we would have paid NI contributions on your behalf, so you will go onto the contributions based part for six months then it gets reviewed and reverts to income based, UNLESS, your illness is bad enough for you to be put in the support group which with PARKINSON'S you will mostly be put from week one. I know it sounds a lot of hassle but the average award is about £280 per week, ON TOP of any pension your getting. Also your rent will be paid or if still paying a mortgage, then the interest will be paid, but the rules for a lot of these are changing but they haven't came into our office yet, but the sooner you claim the better. YOU WORKED ALL YOUR LIFE UNTIL UNABLE BECAUSE OF I'LL HEALTH AND THAT'S WHY YOU PAID NI CONTRIBUTIONS......SO IF NEEDED THROUGH ILLNESSES YOU WOULD BE OK..........good luck mate.