I thought about you this morning when I woke up. I don't know how to advise you any further but I do know what the pain is like. I couldn't stand or even sit at the height of my attacks, I just had to rest bent over a chair.
You don't want to loose your gallbladder but you need to watch your health carefully so you don't become too ill. Make sure you drink plenty of fluid.
You have to judge what to do for yourself.
If you think you need to do another flush then do it, as I am sure you are willing to do almost anything at the moment. You can do one after another in an emergency but there must be a limit to how many you can do in a row.
Have you read the grandma Nada story about how she got out her stones; he's the link