Im not sexually active, never have been. (pretty much housebound and never even had a relationship) i got and std (trich) from pelvic floor physical therapy. is that common? how is that even possible? im so shocked that this even happened to me?

Very peculiar. How was trichomonas diagnosed? Microscopic exam of vaginal fluid is very inaccurate, especially if done on a stained specimen and not by "wet mount", or by an examiner with limited experience. The diagnosis is not confirmed except by culture or DNA testing. If diagnosis is correct, it is very unlikely from the physical therapy. On rare occasions, Pentatrichomonas hominis...

It is rather strange and unusual. Most people wear sterile gloves when doing the therapy. If you had no symptoms the it was possibly a contamination. If you did it is possible from the Digital PT if used.