Hello. Thank you for asking at HCM. I went through your history and understand your concern. I would like to make following suggestions to you in reply to your queries: 1. As your symptoms are for last 3 days, I would first think of allergy and infections (viral or parasitic) as causes. I treat my such patients with antihistamine like cetirizine/hydroxyzine and montelukast for 3-5 days. I also prescribe course of anti-parasitic drugs if intestinal worms is a possibility. 2. Common foods causing such symptoms are milk, egg, peanut, tree nuts, soy, fish, shellfish and some fruits/vegetables. Sometimes cheese, preservatives/colors in packed foods can also cause such reactions. Please try to correlate your symptoms with intake of these foods to identify the food that may have caused you allergy. 3. Antibiotics and pain killers can also cause such symptoms. So if you are currently taking any, please consult and discuss with your physician. 4. I can understand your concern about anaphylaxis. But unfortunately it is not predictable. From your symptoms, at present I think it s only urticaria and angioedema. However, a severe reaction may result in anaphylaxis. Shoulg you have any symptom like - dizziness, severe abdominal pain, vomiting, breathing difficulty, suffocation, throat constriction, feeling of losing posture, etc - these symptoms may suggest anaphylaxis. Please consult your physician immediately in such case. 5. If you don t have any of above symptoms, you may have simply urticaria and angioedema. In that case, I would treat with montelukast and an antihistamine like cetirizine/hydroxyzine for 3-5 days as mentioned above. Hope above suggestions will be helpful to you. Should you have any further query, please feel free to ask at HCM. Wish you the best of the health. Thank you & Regards.