Pink: first, take a breath. You are not going crazy, you're not a stalker; as you said, what you're going through is common and very real. It also need not be seen as a reflection of your "true" sexual preference--its source is much deeper than that, and there have been many people who confused those fierce feelings for attraction to someone whom they wouldn't ordinarily be drawn to.

There are two clear issues at play here: your transference/attachment feelings for your T, and your questions about your sexuality and where it fits in your life. The transference is something you can work out with your therapist, in a healthy way. It's a great opportunity to learn a lot about yourself, and do some healing.

But I urge you, if you do truly question your sexual preference (based on other experiences/feelings in your life, not your feelings for T), to seek out a gay Christian group or pastor. As long as the thought "I am having strong feelings for my therapist" is followed by "Am I gay?", you will be carrying a bucket of shame and fear that won't easily be resolved with someone who believes you should feel shameful about it.

I'm not saying to dump your therapist, or anything like that. But you deserve the opportunity to explore your feelings without shame, and come to your conclusions in a supportive environment. I've seen too many of my friends and lovers suffer unnecessarily under the pressure of trying to resolve their identities as gay Christians alone.

Either way, good luck, and be kind to yourself on this journey.