Thanks for writing to H.C.M. for your query.
I have gone through your query regarding muffled voice in your ear following trauma to ear by air hose which was loud enough.
By considering your complaints and analysing the facts it appears that most probably your ear drum had ruptured but need not to worry. Such perforations are healing very fast. You have to follow these-
(a) Keep your ear clean and dry don't put any ear drop
(b) Antibiotic- Take Amoxicillin
(625 mg) thrice daily.
(d) Steam inhalation.
I hope this will help you. If unfortunately you don't get relief than you have to consult your ENT doctor for investigations and treatment.