it's funny when you describe that feeling of nothingness... but wanting to feel so badly.... I was feeling like that a few days ago... I'm not diagnosed with anything, I'm not an expert by any means but....
people can feel that way. But it doesn't mean you cant feel or wont again. I have some moments like that... where i'll be devoid of feeling but wanting it so bad, but ...oddly enough.. someone told me that I'm a very passionate person... offhandedly.

Anyways... you're not alone... and dont give up. The feelings are there so close... I hope they poof back in place like they did for me. Try to connect with things that made you passionate. Anything to bring back the feeling.