I will of course feel ashamed if my attempts to find the exploit end up being duds and or if I helped to further any panic. All along I was telling everyone to be calm. Even in my PMs I was urging everyone to be calm.
I don't think you should feel ashamed if it turns out that you don't find an exploit. I'd say the value you add to the technology in general by evaluating it in a through manner adds far more long term value to it than the amount you received in the bounty.
I think it's always good to poke around and try to find exploits. Strengthens the technology. Not every exploitation attempt can be successful, even trying and failing adds value.
edit: Read the other posts. Yeah, definitely take some time to rest. None of this stuff is more important than your health.