Just wanted to add a word of caution concerning eating too much Comfrey... Comfrey leaf has been regularly ingested by thousands of people without negative effect, but there are studies that suggest that comfrey root has a component that can damage the liver. It is therefore recommended that comfrey root should not be taken internally.
I would do some serious research on this herb before taking too much of it. There is a lot of conflicting into about it.
lettuce is a great remedy for some to alleviate indigestion, but for someone with a bad gallbladder it can make things WORSE. Be careful!