Low frequency hearing loss

About a month ago, I woke up and found that I was suddenly half deaf in my left ear. My hearing was also obviously impaired in my right ear, but not as much as the left. In addition, I could hear no deep bass in either ear. I have no idea what could have caused this.

My hearing response got lower and lower below about 200Hz and dropped suddenly after 100Hz. I could hear absolutely nothing at any volume below 40Hz. I used to be able to hear clearly down to 15Hz. I saw a doctor about it and finally was referred to an audiologist, who I saw a week ago. The audiologist tested various frequencies, from 250Hz up. She did not test below 250Hz, but she said that based on my test, my hearing was better than most 5-year-olds'. To this, I told her that most 5-year-olds must be deaf (expletive), and asked if she considered my deep bass response to be important. She said to come back in a week if I'm still having problems. I had been having the same problems for over 3 weeks at that point.

My hearing has slowly recovered, but it is not anywhere near what it used to be. It's like I'm hearing my whole life through a cheap pair of "detailed" or "neutral" headphones, and it causes constant misery. My hearing response constantly changes. Sometimes I can barely hear what people are saying over the phone, and sometimes it isn't too terrible, but it never reaches what it was.

It seems like I shouldn't be complaining. If my current hearing tests so well right now, then my ear must have been more golden than the pot at the end of the rainbow before I lost most of it. Now I'm normal, I suppose. I don't really know who to ask, other than a community of audio lovers. What should I do, Head-Fi?

edit- I don't know if this is in the wrong section; I'm a nub. My ability to hear low frequencies has recovered the least. The rest of my hearing is bad but still existent.

Yeah, my general doctor looked inside my ear and couldn't find anything wrong. No wax build-up, no sickness, no swimming. Just a sudden loss when I woke up one morning. He referred me to an ENT. The ENT (ear nose throat) doctor did the same thing, then had the audiologist at his office test various frequencies 250Hz and above.

I have tested myself before and after, and I could hear from about 15Hz to 20kHz before (I was really sensitive to bass), and now I can only hear from 35Hz to a little under 18kHz. The rest of my hearing range is affected to varying degrees. Maybe it's not too bad, but it's really shocking when it happens so suddenly.

Any other ideas/comments/suggestions?

I used the same equipment to test both times. I usually use an equalizer and obsessively adjust the settings for each gear setup, so it should be more or less neutral. I adjusted the bass up to neutralize the frequency response according to the Headroom graph for my current phones, the Sennheiser HD650s. I usually use the Fiio E7 as a dedicated DAC for my La Figaro 339, but the 339 sorta blows when it comes to the very bottom. It produces more volume in overtones than it does in the bass tone. I used the E7 as a DAC/amp for the test.

I noticed the hearing loss right away when I couldn't hear my footsteps. I couldn't hear my phone vibrate on the desk. I got on the bus which usually annoys me with its ridiculously loud low roar, and I found that it was eerily quiet. I only recovered a little bit. The sound of the bus' engine which was a deafening roar is now a soft hum. When I'm in the basement of my house, I can no longer hear my family move around above me.

And yeah, I could definitely hear below 20Hz. I'd hear it before I'd feel it. I can't now though. Now I feel it before I hear it for anything below 40Hz. 

I've been like this consistently for about a month. I'm only 18, and I'm already partially deaf.

edit- So, is it possible to get hearing loss more strongly in some frequencies than others? I've only heard of people losing their upper frequency perception.