Hi.
Thanks for your query and an elucidate history.
First of all if you know that drinking alcohol is causing pain in your pelvis like menstrual pains, why should you drink.
Secondly, Google does not tell everything.
Thirdly, the cause of such pains on drinking are as follows:
Something in the alcohol is causing an
allergic reaction in your
uterus, acting directly on the
myometrium (muscles of the uterus) to cause such pains as you described.
There is a chance that you are suffering from a condition called myometritis , wherein you have got inflammation in the muscles of uterus and they get instigated by the contents of the alcohol.
I would suggest you the following:
Get an
MRI of the uterus to see what changes or disease it has got and to decide about the treatment if you need to be getting like
hysterectomy or so.
And you should refrain from all the alcohol brands that cause you this type of pains.
It is possible that some brands of alcohol may not be causing this.