Here is link about low to moderate drinking which shows it can help those with fibro pain. IF you are using narcotic or sleeping pills of course this is not true and it notes it. Respiration rates can lower to dangerous levels even death since all have that effect on the body.
But article covers all this....i just think that having a glass of wine makes sense since we tend to be anxious people and that could calm us down which then would help with pain.
well if you are interested...here is link
http://www.medscape.com/viewarticle/780928
medscape has many great articles...you can just get monthly or even weekly email about topics they cover.