I don’t think shortness of breath and dry mouth are common diabetes symptoms, at least I’ve never heard of them. Tingling in the feet can increase when BG is high in those who have neuropathy, but I don’t know that it does in those without it. Quite frankly, sounds more like a food sensitivity. I get short of breath at times when I drink a very hoppy beer. I was tested for an allergy because I certainly have environmental allergies, but it was negative. The doctor (an ENT and allergy specialist) said food sensitivities can spur all kinds of weird symptoms, and they may or may not ever progress into a true allergy. Does this occur only with certain foods? Have you discussed possible food sensitivities with your doctor?
Edited to add: as to whether 8.3 after eating is normal, it depends completely on how long after eating the reading occurred. Various medical authorities set various standards, but generally speaking a non-diabetic is under 7 within 2 hours after eating.