He replied very quickly and confirmed my understanding that there isn't much research being done on misophonia in general. (He only found 8 scientific articles on misophonia.) Although he said he didn't know anyone doing misophonia research at NIH, he suggested that I look into some of the research being done on synesthesia, "... a neurological condition in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a secondary sensory or cognitive pathway." (Evidently, there is a lot of research being done on synesthesia.) I can certainly see how synesthesia could have similarities to what happens with misophonia - since misophonia sufferers do experience emotional responses to triggers stimulating any (or all of) the five senses (in varying degrees).
I'm always open to any suggestions that leads to even a hint of relief from this condition, and will definitely contact synesthesia researchers to learn more about their studies. (Of course, I'll post any new information I find.)