Yup. Definitely whelmed.

I'm feeling pretty whelmed right now (as opposed to over- or under-).

Yes, it's a word. Archaic, yes, but a word nonetheless:

whelm
verb [trans.] archaic or poetic/literary:
"engulf, submerge, or bury (someone or something): a swimmer whelmed in a raging storm."

So there.



Note: While I like this definition and all, I personally prefer to define it as what it sounds like it should mean: The feeling you get after being whapped repeatedly with something unpleasant, like a large fish. You still get the same general idea, but it's so much more expressive.