It might be prudent to look for an ENT who knows about dive medicine. I went to my family Dr about my concerns about a PFO due to a couple of cases of skin bends I had experienced. He didn't know what I was talking about but said he would research it. He called me back and we scheduled a TTE. Anyway my point is not all Drs understand the needs of divers.Have you seen an ENT? That should be your first stop.