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.
As long as you can relieve your anxiety, the leg pain should go away. Don't forget that anxiety can affect your body in strange ways. Even when you're not feeling any anxious thoughts, or any other anxiety symptoms, it's possible for your anxiety to cause physical symptoms.