We have known of people reacting to OP...some do and some don't. But yes, I'd say that your body is showing signs of doing so.
Regarding the H202, while I do believe that it is good for oral hygiene, it is not great if you have any metal in your mouth. H2O2 (Hydrogen-Peroxid) might corrode these and cause a person to swallow a heavy dose of heavy metal pollutants in the process.
If you give OP a chance, I think you might find that it will do all the things you had hoped that H202 would do.