It's odd that I am on here today because I rarely come here anymore. I probably won't be on here again till next year. However, I have had this sort of ear problem since I was a child and it's a major headache at times.
Caveat: You might be able to disregard what I write below as you may merely have otitis media, a garden variety and nasty ear infection. That's nothing a good round of antibiotics can't cure in a week. However get the discharge cultured so you have the correct antibiotic.
What it was, in my case, was quite a bit worse and OM. I had a cholesteatoma, a slow-growing growth behind the ear drum which can cause the ear drum to rupture and ultimately (if left untreated) meningitis. Usually the fringe or tip of a cholesatoma is visible behind the ear drum when the otolarynologist (ENT specialist) takes a look with his device, but not always.
You will probably want to query the doc you went to and see whether he thinks there is any chance that it is a cholesteatoma. I have had four ear surgeries (age, 6, 16, 20, 36) because of this bitch, including a radical mastoidectomy. I also had my original ear drum taken out and then the reconstructed one taken out and replaced. I've lost 60% of my hearing in my right ear. What it also did was drain my energy a bit, like I am a quarter or half-sick all the time when I was growing up.
Not so great for running optimally but I digress.
Now otolarynologists and ENT surgeons have gotten more sophisticated about the removal and eradication of the cholestoma and it may not come back, but you never know with this one. It is close enough to the lining of the brain that you always have to watch out for these sorts of things. One saving grace is it is very slow growing so if it is discovered you might have several months before you need a surgery.
An ear infection, since it is that close to the brain lining, can certainly cause meningitis if left to its own devices. Thank goodness for antibiotics, this would kill someone in the pre-1900s.
It's a MFer, but you will need to get it checked out. If you need surgery, I had a bandaged head, and could not run for 12 days or so. I walked 2-3 hours a day instead, so it worked out OK. Also, the best place in the country (arguably) to get this taken care of (if you happen to be near there) is the House sp? Clinic in Los Angeles / Torrance, CA.
Good luck, and in this case I hope I am wasting my time and it's nothing major.