Some doctors have felt that Fibromyalgia is, basically, un or under-treated hypothyroidism, since Fibro
and hypothyroidism share many symptoms
and many/most of the symptoms go away if the patient is treated adequately with thyroid hormones.
From the reading I've done, there's no benefit of taking ranitidine for EBV when mononucleosis is active, therefore, I can see no benefit of it 15 yrs later, either.