Your GI sympotms are probably also related to morphine extended release, which can definitely alter your bowel habits.
You could have the AF ablated or if it already was attempted and unsuccessful then you could ask for a second opinion. If this is not an option then an AV nodal ablation may be of benefit in limiting your ICD firings.
This is cricket513 I ran out of room. My question is " Is there anything I can do to stop the nausea and extreme gas. I can't eat much, and everything I eat gives me bad gas. I take coumadin, metoprolol, and 120mg morphine time released. Low back disc problems and acute syotica. Im always in AF while I feel this way. I have a defibrillator, and have been hit allot because of the SVT. The first time I was shocked it caused me to laugh uncontrollably.