I encourage you to embrace the chemical imbalance as the reason. The medications do work and withdrawing from them isn't bad either (if you decide to take a pill holiday or extended non-use).
Finally, it's not about 'normal' focus. It's about you. If you're content with your productivity and behavior, then nothing is needed to change in your life. If you want to maximize your potential, then please consider medication. It doesn't go away (CBT never worked for me). Embrace your choice. Whatever you decide, is normal, it's your normal. That's perfectly acceptable.