The internet is your friend for questions like this. I put "stress and iron depletion" into Google, and came up with many authoritative results on this topic. You can do the same.
You might need to educate yourself about the TMS acronym and its relationship to emotional stress and distress. tmswiki.org provides the basic information, the Structured Educational Program (also on the wiki) goes into it in more depth, and any book by John Sarno MD will explain his theories and how he came up with the acronym.
If you are interested in learning in general about how long-term emotional stress and distress can result in actual physical/physiological disruption, I recommend reading "When The Body Says No" by Dr. Gabor Mate, MD.