Type tinnitus in Internet and you can get a lot of information. I suspect, the neurons responsible for the sterocilia are damaged. Stereocilia are hairs inside the ear that vibrate due to sound. Air passages to the lungs also have cilia, broom-like that sweep up phlegm that can be disabled by smoking. Cigarette smoke contains x-rays and free radicals. (I have several discussions on free radicals, you may access conradofontanilla.hubpages.com). Multiple sclerosis, like motor neuron disease (amyotrophic lateral sclerois) is caused by free radicals.
Serotonin may help, you can get it from fruits, or from tryptophan. Serotonin is a neurotransmitter, it is also converted into melatonin that can repair organs. Damage to cell receptor is highly possible; free radicals are responsible for such damage. So antioxidants from vegetables and fruits might help. Free radicals are responsible for atherosclerosis that can result in tinnitus.
You may not get advice from conventional medicine about free radicals because it does not recognize them as causes of disease. However, integrative medicine recognizes them as causes.
Aspirin may cause an imbalance between thromboxane and prostacyclin that are prostaglandins that are sometimes responsible for inflammation. A continuous taking of aspirin induces the accumulation of arachidonic acid that may be converted to interleukins, responsible for allergy to any drug (Sears, B. The Zone). Researches must be conducted using the free radical theories of disease as framework.