I think it's okay to have doubts, and right now you rely on the larger community for support because you haven't connected with another teacher (as far as I know). I'm sorry people got mad at you for talking about how you feel.
For what it's worth, you have a couple of little practices you can continue to do if you like them, and you can always learn all about Theravadan Buddhism without having to convert (unless you want to). The level of commitments you took before aren't required here!
And yes, the people who were saying in that other thread that tantra is evil and whatnot were probably not going to be of any help to you. Honestly, I think you need practice support for whatever you're comfortable doing right now. I don't see why doubts aren't okay. I have all kinds of troublesome little thoughts. Hang in there