I'm really impressed you've done your research on healthy veg eating before posting on here
And yay for becoming veg!
As the others have mentioned I doubt iron would drop that quick in one week. Most likely blood pressure. The only times I've fainted have been due to heat/ or standing up quickly or standing for long periods.
I think some new veg*ns and omni's assume we all have low iron, but if you eat healthy you shouldn't be of any less advantage than an omni. Often people make the mistake of taking an iron supplement when they don't need it. I did and my iron levels were too high on a vegan diet.
However, it may not hurt to get a blood test done. Then get another one done 6 weeks after turning veg.
