>>12521300You aren't actually touching your tympanic membrane, you are touching the bony part of the EAM. In humans, the EAM is usually not completely straight and for most people it would require specific angling or straightening of the EAM in order to hit the tympanic membrane.
>>12521349An ototoxic substance placed in your outer ear would not affect your hearing, unless your tympanic membrane had already suffered perforation. You most likely have either cerumen obturans or idiopathic sudden sensorineural hearing loss, both of which are reversible with correct treatment, though sudden hearing loss requires initiation of treatment within 3-6 weeks of initial symptoms.
