I'm sorry for your loss. When I was caring for my parent ( I lived 300+ miles away ) I wasn't working at the time as had been staying with them to care for them after a terminal diagnosis.
They passed away and as an only child ,all arrangements fell to me.
It wasn't feasible for me to return home, and then come back again for the funeral etc .
Once I had done the necessary death certificate, funeral arrangements, contacting banks , pensions , personal pensions , cancelling of various things etc, I set to work clearing the house.
It was our family home so was full of lots of memories and a fair bit of stuff that is collected from having lived their as my parents had for 55+ years. In 3 weeks I had managed it. Trips to charity shops , lots of paper shreading, bribing the system to take lots of black bags. It was hard but I knew it had to be done.
Can you write yourself a timetable , and set yourself goals to achieve them ?