I understand completely what you are describing. I too was certain I wanted to transition and had very few doubts, but after a few weeks on Spironolactone, the desire ebbed substantionally leading me to really question myself. Seeing how you had your orchi at a fairly young age, did you go on any sort of hormone treatment like Estradiol? If so, how did that make you feel?
Don't get me wrong, I am truly enjoying the effects of the Spironolatone (and now Estradiol too) just because the "urges/compulsions" I have experienced my whole life are now quiet and no longer an issue. I just feel kind of indifferent to the transitioning part now. I still wouldn't mind transitioning, but it is not my primary focus in life now. For me, I think the testosterone suppression may be the key.