Touchy w/ a diaper rash

I guess I get careless sometimes. Or I just hope that the new things that we try are going to work out fine with Tyler. Sometimes I just try too many new things at once. Tyler has had a horrible bright red diaper rash since this weekend. Screaming when we change his diaper, wipe him, and put on diaper rash. The mistakes that I have made with his eating:
--Two weeks ago attempted to introduce products w/ small amounts of soy (last ingredient - soy lecithin) - it didn't go well, slight rash and diarreah.
--This weekend bought Turkey Bacon (notmally it's safe) and didn't read the ingredients. It had soy and possibly some dairy in it. He has a few small pieces before everyone knew.
--This weekend I bought roast beef (same brand that his ham that he does will with) - but it has "natural flavors" - which sometimes can be milk.
--I found kids cookies at target (packaged in nice little snack bags, chocolate chip, oatmeal raisin, etc). I was so excited because the ingredients didn't show milk or soy. They do have eggs and oatmeal in them - but with a few other attempts with small amounts both of these allergens he seemed fine.

Order of events were as followed:
Sat lunch roast beef
Sat night - Tyler ate his new Target cookies (and loved them)
Sunday and lunch - unsafe Turkey Bacon anf roast beef
Sunday night - horrible diaper rash (we kind of saw it coming becuase of the T. Bacon)
MOnday - cookies, roast beef
Monday night slight diaper rash
Tuesday - no cookies, no roast beef, no t. bacon
Tuesday night - HORRIBLE diaper rash

When I dropped Tyler off at day care I asked how he had been this past week. "Touchy" they said. They normall say "great", "fun" etc. This is a good sign that he also is comsuming something that is bothering him.

I'm going back to the basics, after I go to the grocery on Thursday. His regular grahams and more safe (and therefore more expsensive) foods.

Life with allergies.