Gastritis and skin rashes can certainly be caused by a gluten allergy or by Celiac Disease. You may want to get tested for anti-gliadin IgA antibodies and anti-gliadin IgG antibodies, as well as wheat IgE antibodies.
There are healthy alternatives to wheat bread, such as multigrain gluten-free breads - check your local health food store or search online (see http://gfmall.com/ ). Or you might try Ezekiel bread instead (made from sprouted grains only, no flour).
Chronic Lyme Disease, Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, Pancytopenia, chronic malabsorption/malnutrition, etc.; G-Tube; Currently TPN-dependent.
Meds: Zofran, Pulmicort, Heparin (to flush PICC line), Claritin, Colloidal Silver (used topically), IV Milk Thistle, probiotics.