tldr I told my bosses boss I was unhappy. My peers then told me that my manager was asking leading questions about me. I told HR which told me that's retaliation and they should investigate. I declined. In the next 1:1 I got negative feedback from my manager about an apparently rude email I sent two weeks ago (I asked the new resource if he was familiar with my project area and what projects he worked for in the past in the company which I think was super reasonable).
HR followed up again asking if they should investigate. My main goal at this point is just to change orgs. Should I let HR investigate? What would that look like and what are the odds of the success?