Everyone is different regarding the number of bathroom visits. I had the Jpouch due to family history issues (my health was good).
I go about 5 times a day, depending on how much and what I eat. I have discomfort at times but not urgency.
Someone who was very sick before the operation might not have as good an outcome, it depends. 12 - 18 times does sound a lot though. If there is no reason for it that you know, you should probably see your doctor to rule out a physical issue or pouchitis.
Im sure you do have gas, your stools just sound watery. If you can firm your stools you should be able to pass gas (lying down at least) which would reduce the frequency further.
3 months out and still on painkillers does sound strange. Did the doctor prescribe that? why are you in pain? All my pain came from gas but I stopped all medication within 1 month
Do you take loperomide? how about soluable fibre? hows your diet?
There is a good chance someone else on this group had the same illness as you to start, they may be able to provide further support