I found some informtion on (I think) the Mayo Clinic, that you want to watch for in regard to any major problem with the GB. Your urin turning dark (like tea) and/or whites of the eyes yellow, or skin yellow. Is a sign of Jaundice probably caused by bile backing up. I had it happen to me (the urin) and was told by a doctor to dring a lot of water that did help, and also the tract became unblocked probably by the Olive Oil.
I have also have a feeling of pressure build up in my stomach just below the ribs, and it happens nearly every time I have an attack. I haven't found much I can do for that. But Blueduck said taking a dose (tablespoon in glass of water) of Epson Salts will usually stop an attack.
Hope this helps...