Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
Cocaine causes mucosal congestion and that has caused blockage of the eustachian tube and hence ear blockade. You should take up steam inhalation as much as possible along with chewing of chewing gum. Also continue taking anti histamines
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Wish you good health,
Dr. Srikanth Reddy M.D.