Hi, Dark Stranger . . . I will agree that too much salt can raise the blood pressure but I am wondering if any of those things you eat (especially pizza and Chinese food) had monosodium glutamate (MSG)?
Symptoms from people allergic to it can range from chest pressure and pain to shortness of breath to severe headaches to extreme stomach discomfort and even diarrhea.
See if any of your home made ingredients have it in there (notorious in many meat tenderizers and meat seasonings).
MSG is becoming more intolerable to more people and some companies are working to remove it from their ready to eat foods.