Wow, Bee, I have never had any real reaction to IVSM and consider it a miracle worker. I'd hate to see you pass on an opportunity to feel better sooner because of what others have experienced. You won't really know until you try it and you might find it as uneventful as I, and many others, do.
Sure, you'll hear a bunch of differing opinions, but remember that everyone is different and also that the online population is online for a reason! We tend to be the ones who feel poopiest most of the time. Most MSrs who feel great aren't online a lot because they're off living!
Now, someone will be along shortly to tell you a horror story, I'm sure. But, I put off getting an AFO because of horror stories and I love mine! In fact, I could kick myself for waiting so long to get it.