New here, but I can totally relate. I used to see a sychiatrist (missing key) once a week and she recently took another job, about three months ago. She was big in my life and I relied on her, only knew about my disorder about a month before she left. I obsess over her and I try to resist it.

What I find seems to work is reminding myself that it would never work and how irrational it is. Try to stay busy, attention to detail to not day dream so much.