I hope you don't mind me responding to your post although you probably await Andreas' answer.
If you have a gall stone in your gall bladder you can me almost sure to have gall stones in your liver as well.
Since past my first flushings (I did 19 so far) I experiences similar symptoms I would recommend taking 1 to 2 tablespoons of lemon juice plus the same amount of olive oil first thing in the morning every day.
Furthermore, despite the fact that this is against Andreas' advises in his book - The Amazing liver cleanse- I would recommend to do a further flush as quickly as possible. At least this was what helped me a lot. As a matter of fact there were quite a few flushes I did at a one week distance simply because of symptoms of indigestion like you have.