I'm sorry you're going through this and understand your frustration. I'm afraid I'll never be the same person also. Even on "good" days, I feel like a completely different person. But as soon as I accepted this, I felt better immediately.

I went through a phase of frustration that I would never be the same person, then a phase of acceptance of this fact, followed by grief. I stopped longing to be the person I was. I stopped making my goal 'To feel like my old self.' It simply isn't going to happen. All I can do is accept who I've become and focus on the positives. I am much more compassionate and understanding now. I appreciate all the simple things and wonderful people in my life much more than I ever would've been able to before.

I know a lot of times our issues (in your case, frustration) involving PCS are not within our control. It's like telling a depressed person to be hopeful. Just know that it will get better. I do know that I'm a better person through all of this, and I'm sure you are too. Anyone who can endure PCS is a strong person.