I'm not a doctor either, but based on my experiences, here are some others I can think of off the top of my head:
- Folate, a particular mineral, or other components of the mix could have been lacking before, so adding them might have triggered a "start up" reaction. Many of us have had experiences where we feel ill when starting a particular supplement, but in some cases it's actually a good thing because it just means that the system is moving again and trying to deal with a backlog of problems. ...Of course, on the other side, sometimes it's a sign of deficiencies in some other area. Just another part of what makes trying to solve all this so delightful. Building up your supplies of everything more gradually might help this some.
- Some people have issues with large quantities of sulfur-based substances, and glutathione is one of those.
- If you have any stress associated with needles, sometimes that's enough to crash people trying to get an IV drip too.
There are tons of other things that might have gone wrong specifically for your body chemistry, though. We often seem to have weird reactions or sensitivities to things that tend to be "perfectly safe" for other people. I think probably the only way to know is to try the individual components out and see if you can pinpoint the issue. ...Although, again, a poor reaction doesn't always mean it's bad for you. ...Sometimes just that you need to take things more slowly. There are a lot of good things in the mix you had that would probably be worth checking out on their own. I agree, though, if you had a bad reaction to the mix, it's probably not worth trying it all together like that again.
As others mentioned, I believe that the bright yellow colour to urine is usually related to excess riboflavin (usually from taking a large supplement - very little riboflavin is actually able to be absorbed at once). Is there a B complex, or something else with riboflavin in it that you stopped taking at the same time? As far as I know, B12 should store in your body, so I don't think there would be a significant change in urine colour. I could be wrong, though.
I had issues with a vitamin drip as well, though I'm not sure what part of it, since I take all of the things involved orally without problem. I had the most uncomfortable cramping sensation spreading up my arm and into my chest from the IV site. Stopped the IV before it got to my heart...just in case.
I hear they're great for some people, though. Sorry you had such a bad experience.