These days transsexuals prefer a different term. The problem is that the general populace wants to associate it with Sex (and also related to the outdated term Sex Change). What the general populace doesn’t think about is the discordance caused by a mismatch in the indicated physical gender compared to what one believes themselves to be mentally and the possibilities for reconciling the 2.
The problem with therapists is that not everyone has experience with gender issues. Said another way, you wouldn’t want to see a dermatologist for a heart problem. Are there any other trans people in you area who might have recommendations?