Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

That said, there are also atypical migraines that cause hypersensitivity to sound where sound seems louder and it feels somewhat painful. Migraine meds help with that.
http://www.calmclinic.com/anxiety/symptoms/hypersensitivity-to-sound
This website is really good at explaining symptoms and causes and then giving good advice. Just ignore the bit where they ask you to do the test (think they want to sell you something).