Most likely its food intolerance. I had this problem along with brain
fog, gastro symptoms, emotional /mental symptoms etc. for about 18 months. Went off wheat, dairy, corn. thought I was better but still had reactions to things like strawberries, tomatoes, rockmelon. spicy food, grapes. avocado etc etc. These are all high in natural food chemicals such as salicylates, amines and glutumates. Improved after 6 weeks on elimination diet.