Everyone handles it in the way they know how.
I'm the opposite of you. I don't see past today. It makes it difficult for me to stay on any one path for long. It gets between me and other people in my life.
I am present, but I don't act on things--everything is internalized.
I think, ultimately, that there is a balance between doing and thinking, one that allows a person to think and perform actions right now, to control our own destiny--it's just a matter of staying focused.
I find meditation helps me to set my intentions into motion. I'll focus on short term goals, things that I won't get caught up on, that way I don't stagnate.
Stagnation, can occur in dwelling in the past, being present, or worrying about the future. So if you are stuck worrying about the future, try focusing on what you can do right now to ensure a better future--that way you do not stagnate, you can keep moving on with your life and your healing.