Found this page on hyperacusis on the website of the ENT academy:

http://www.entnet.org/content/hyperacusis-increased-sensitivity-everyday-sounds

It notes that hypersensitivity to sound is usually an auditory processing disorder, not purely sensory in nature. It also notes that some individuals with hearing loss also have low tolerance to loud sounds, with a narrow range of tolerable volumes at certain frequencies. (See "recruitment") Sound sensitivity is also associated with a number of other conditions, including migraines.

And a random internet article about recruitment. Can't vouch for it's accuracy, but FWIW, it's cited on a number of other pages:

http://hearinglosshelp.com/blog/recruitment-from-hearing-loss-explained/

...pronounced like the long vowel and first letter of the alphabet...