Scar tissue on the ear drum is usually caused by repeated ear infections. The scar tissue can lead to difficulty hearing and eventually ruptured ear drums. Surgery is one means of avoiding progressive hearing loss or ear drum rupture. No patients have reported taking Scar tissue removal (eardrum).
USCIS normally responds to RFE's within 60 days, however they do not have processing times on how long it takes them to respond. It can be longer than that. I would call the USCIS number: 1 (800) 375-5283 and submit a service request, if you do not hear from them soon.
Currently, the national standard for ambulance response times in metropolitan areas is less than 10 minutes. By calling 911, you'll have at least two emergency medical providers - and depending on where you live, additional first responders - addressing your chest pain in less than 10 minutes. That's much better than driving to, and waiting in, the emergency department.