On the side of the shower opening that will support the door, hold a jamb piece against the wall so that its lower end fits into the base track. Without moving the track, use a 4-foot level to adjust the jamb until it's plumb. Stick a pencil through the jamb's screw holes to mark the wall.
I was asked to answer, so I'll give this my best shot, please know that I do not have any specialized or trained medical knowledge, only practical experience from Ashtanga yoga and meditation. So, yes, walking does reduce anxiety. 1.
You will out pace your anxiety, which is a cold drippy miasma. Even if only for a second, for a brief moment; your anxiety will be behind you, and when it's behind you for a moment, you can see it can stay behind for 2 moments...then start sprint walking again.