Hi welcome to Health care magic forum.
Thanks for choosing H.C.M.F.
After drinking alcohol, you had cramps, gas, and diarroea, it is repeating when ever you drink alcohol.
You have got sciatica
as well frequently.
You had diarrhoea
by infection of the gut or may be due to allergy
of alcohol. You better stop taking alcohol, as it is repeating when ever you take alcohol.
You have got rhinitis, that is cold
, may be due to allergy to some of the foods, dust, or some thing else. It also may be due to deviated nasal septum
I advise you to consult an E.N.T. surgeon, for diagnosis and treatment, you may need to have an operation, if D.N.S.is present.
For sciatica you can use medicines under the supervision of the orthopedic surgeon.
Wishing for a quick and complete recovery.