The wheat buildup you mention - wheat intolerance or celiac sprue - does not present as you describe
see
http://www.nlm.nih.gov/medlineplus/celiacdisease.html- for indepth discussion of this issue.
Your weight gain and bloating with meals along with the sensation of shortness of breath concern me for mild heart failure.
If you have risk factors like high blood pressure or diabetes, then it is even more likely.
Have your doctor evaluate your heart and your fluid status. Once this life threatening issue is addressed, then you can investigate the possible gastrointestinal reasons why your symptoms occur.
please keep me posted
best wishes
DrStephanie