After two years of trying over the counter meds (pills, patches, liquid drops) I’m open to suggestions.

After two years of trying over the counter meds (pills, patches, liquid drops) I’m open to suggestions. I don’t know what this is I know it occurred after I got a pedicure two years ago. Ever since then my nail does not grow the same and falls off. I’ve went to the doctor about it and they told me the only thing they can do is remove it but that is all they told me. Does anyone know what this can be?