Serious question: What will my life be like when my dementia is full-blown?

I'll take your diagnosis as given and ume this was not a casual diagnosis without expert and complete evaluation. My knowledge of this condition is from the Mayo Clinic web site which you can access. I do not think you necessarily have to ume the future development of the listed possible sequella. My advice would be to speak to a lawyer and make sure you have a valid living will and proxy and include in this your wishes re: your likes and wants even if you can not express them at that time-for example that your favorites musical recordings would be played even if you seem not interested etc. The other advice would be to" Carpe Diem" in your own way. Best wishes and hopefully your fears will never be realized.