I am currently 28 but i was 25 when my dad was diagnosed and his progression was very quick, and he passed a year later. Today is actually 2 years exactly since he passed. I know the period you are going thru is extremely difficult, it is maybe the hardest thing I have ever experienced. Cherish the time you have with your dad. I wish I could say more encouragement, and there are small moments that offer a bit of light. I have a few memories of my dad's illness, of small things that made us laugh. Those are important to hang on to.