Not as long as you sweetie, but a long time. John "wasn't right" from early 2001, but it took 2 years to persuade him to seek medical advice. I cared for him for 12 years after his diagnosis, but you've been plodding this damned hard road for a lot longer.
No wonder you're struggling sweetie. What a heroine you are. I hope you're getting lots of help from any, and every source available.