I agree with you: the B6 in the multi is probably not causing the symptoms. I think the doses that cause head tightness are over 100 mg.
There are 4 available forms of B12: cyano, adenosyl, hydroxo/hydroxy, and methy. The cyano form is considered the least desirable, I think it's because it doesn't occur in nature and not everybody can convert it (like me). So, your doctor probably means the other three. You might check with him.
There really is no such a thing as a no-sulfur diet, just like there's no such thing as a histamine-free diet, but we do our best. For low sulfur, I did quinoa (buckwheat and amaranth are OK, too), carrots, celery, zucchini, and greenbeans, sweet potatoes, nuts except peanuts and Brazil nuts, coconut and olive oil, fruits (except four on the list that I forget.) Dairy-free, soy-free, egg-free, nothing with eyes. I forget what dairy substitute I used, probably almond since I don't think rice was on the list.
Mindy, you never said whether the antibiotics contained sulfur - is that the source? It could have nothing to do with the spray, if that's the case.
As I thought more about my low sulfur diet, I realize that I gradually increased sulfur items over the course of the 4 months, so it's not really fair to say I was on it strictly for that length of time. It was just much more than it was a few months ago. The hard part is nothing with eyes. I'm also trying to follow the no yeast diet (b/c of all the ABX I've taken), which doesn't work very well with the low sulfur diet Plus, I'm pretty thin as it is and need the protein to maintain sugar levels.
I was taking amoxicillian, which isn't a sulfa drug; however, from what I've read it likely contains some type of sulfites/sulfates for preservation. The same is true of the Nystatin and esp. the Unisom I was taking. I think the combo of these with their preservatives sent me over the top.
Thanks for the overview on b-12; I believe the cyano is what's in most regular, cheap B complexes, right? I will have to experiment with adenosyl, hydroxo/hydroxy, but I plan to stay away from the methyl. Is there a way to determine which of these 2 would likely be best based on my SNPs?