after eating fish and chips at a not so good restaurant, approximately three hours later I developed muscle ache in my legs and neck, and then starting have severe chills and shaking. I had bad headache also. Although my stomach seemed upset, I had no diarrhea, or vomiting. After several hours of rest the symptoms abated but I still have headache
Hello, Thank you for asking at Chat Doctor. I went through your history and would like to make following suggestions to you:1. From your history, I would first think of "Histamine fish poisoning", a kind of foods poisoning resulting from eating improperly preserved/improperly refrigerated fish. The symptoms are due to excessive release of histamine in body.2. Were I treating you, I would suggest you taking sanitizing and HY Chat Doctor.  I would also suggest you to take paracetamol for headache.3. If you have any of the - dizziness, swelling in throat, breathlessness, suffocation, etc. - please consult your doctor immediately. 4. Such occurrences can be prevented by avoiding fish from not-so-good restaurants which might not be maintaining high standards in preservation of fish. Hope above suggestions will be helpful to you. Should you have any further query, please feel free to ask at Chat Doctor. Wish you the best of the health. Thank you & regards.