From my experience attachment is really painful while liking the T is not painful at all. I know when I'm attached because I'm too obsessed with the T, I daydream and fantsize about them, I want them to hug me or to love me, with my previous T it was really painful and I wasn't even able to focus on other things! It's like he was my world.
With my new T, I can recognize that I only like her, I can see that she's skilled and has qualities, but it's not like I daydream about her. I noticed that I become really attached to male figures mostly, so male therapists and not females.
In general attachment is super strong...I don't know if it's normal to feel pain when attached, maybe it has to do with childhood and not having a secure attachment.