Idk what to do anymore. Confessing isn't enough.

I've confessed things to my school counselor (from now on referred SC). First I write a really long letter about everything and thought that that would be it. But soon I remembered more stuff and then had to confess that in a nother letter. Now another thing has been on my mind and it's absolutely horrifying to tell her but I've written another letter to her about it and will be giving it to her today. But it's not enough! I thought this would be that one last thing. The worst things to confess and if she still believes in not what I fear I am then I can move on. But of course now something new has come to mind and feels horrifying to confess and I don't want to talk about it or confess it (also because I don't even fully remember the thing I'm worried about), but I know that if I don't confess I won't be able to move on. I feel a bit sick and like I'm not allowed to move on from this worry without confessing it. I truly don't know what to do anymore.