So sorry your feeling so sad. I know how horrible it can be as I terminated on 15 Jan this year, I just couldn't bear it, all these questions kept coming up in my head, questions that I could no longer ask my lovely T as it was all over, done after two years, just like that!
In my case, I wrote to my T and asked him to stagger the ending & that I was finding it SO much harder then I expected. It was the best thing I ever did as it really helped me process the ending & enabled me to cope. I was still sad but after a while the pain eased.
Is it possible you could ask your T for a couple of more sessions spaced further apart ? Not sure if it would help but you seem to have some questions still - sorry I can't be of much help but it looks like your T really cared about you.