Ennie,
12 years ago, I suffered from this same problem. Visits to many doctors in Nigeria did nothing to help and finally my then-company flew me to Holland to see the company physician (a GP in Holland). he referred me to an ENT specialist who prescribed Nasonex which cured the blockage within minutes. I still have occasional blockage of my left Eustachian tube and always find that an application of Nasonex cures it very quickly