I think it is very likely that the cumulative damage to your liver from years of drinking alcohol has finally gotten to the point where you are having problems that are obvious. Fortunately you can repair the damage and a good way to start is by doing one of the programs featured on this Forum. I found that when I did the Parasite Cleanse in H. Clark's program that I completely lost the physical urge to drink alcohol. Years later I had a glass of wine and broke out in hives.
The rumbling is probably gas in your small intestine which is in back of the liver tho I suppose it is possible that some gas forming yeasts or bacteria have gotten into your bile system. If this has happened you will likely be forming lots of Gallstones so starting Liver Flush programs would be beneficial.