If you are looking for trained professionals in psychotherapy, this is an excellent website with resources in Bangkok.
In addition, I'd like to recommend the services to expats given by PSI on Sukhumvit 43. They provide services in several languages - English, Thai, French and Italian.
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Directions/map: Enter soi 43 from Sukhumvit; if you're driving, you can enter soi 43 from either direction on Sukhumvit. Go down the soi Protected content . You will see a yellow sign that says "PSI" on your left, at the entrance of a small alley. The alley is tiled in tan and blue tiles; go down the alley. There is parking directly in front of the small house. By BTS, use Phrom Phong BTS station, exit 3.