Can food allergy cause stomach cramps, skin rashes, and white coated tongue?

Hi doctor,

I have a question regarding food intolerance/allergies. I have never had a food allergy, as far as I know. However, in May, I experienced severe tooth pain, and a fever. It was an infection in my tooth but I got that cleared from the dentist. A few days later, I experienced tongue-tingling and a white coating. Sometimes the coating would be yellow. Before all of this though, I had stomach cramps every morning and I always put it down to my anxiety. My tongue-tingling and raised papillae have never left since, and it has been three months. I struggle with tingling, soreness, and dry mouth every day for at least 70 % of the day. I noticed I may have a food allergy after I started developing a rash a few weeks ago, sometimes my skin would be really itchy, and I would have no rash also. I also suffer from loose stool, sometimes with mucus, this has been ongoing for about five months, I also have severe brain fog and fatigue sometimes. I am 23 years old and overweight but not obese. I rarely eat fruits and vegetables and I eat a lot of rice, noodles, meats, bread, etc. Could it be a food allergy or an intolerance? I would like to investigate this more before I visit a specialist.