Decreased sound tolerance is a general term ...
Hyperacusis is an abnormal intolerance to ordinary,
everyday sounds, which may develop in association with tinnitus related anxiety and distress.

Hyperacusis can come about due to neurological causes..
Damage to the brain or the neurological system..

Migraines is a neurological syndrome as well...
Which can include the symptoms of hyperacusis..
As well as Chronic Fatigue Syndrome....

Hyperacusis may develop with a number of conditions affecting the auditory pathway (including acoustic shock injury, Meniere's Disease,
otosclerosis, perilymph fistula, Bell's Palsy), psychiatric disorders, neurological injuries and disorders (including head injury, migraine),
adverse reactions to some medications, autistic spectrum disorders, Chronic Fatigue Syndrome, fibromyalgia and Lyme Disease.

http://www.dineenandwestcott.com.au/hyperacusis.php