Default Sound is all messed up

I can't find anything like this. I wake up this morning to a call and upon hanging up, the hang up sound is a lower tone than normal. I think nothing of it since I'm still out of it. Later, I adjust the phone volume and the beep that it makes is the same lower tone. At this point I try putting on music and it sounds like it went down an octave. I'm kind of freaking out because this is a MAJOR problem for me. It does the same thing when I plug headphones in so it isn't just the speaker. How in the world does this happen and what can I do to fix it? Was there an update this morning that may have done this?