Hello, The pain in the stomach muscles is probably due to a severe cough. Actually, cough is executed by using the stomach muscles. So, severe cough already exhausted the stomach muscle and may overuse it so the muscles are paining. I also suspect there may be some infection. In that case, I may advise you some antibiotics. I would like to give some diagnostics so that no possibility can get overlooked and some treatments for some relief now. Please do these diagnostics: 1. Complete Blood Test and blood culture 2. Sputum culture 3. Esophagoscopy I would give some medicines: 1. Levofloxacin: 500 mg orally once a day for 14 days 2. Guaifenesin / Pseudoephedrine, 600 mg-120 mg: 1 tablet orally every 4 hours,Total dose: 4 tablets per 24 hours Duration: 1 Month 3. Diclofenac potassium immediate-release tablets: 50 mg orally 3 times a day; an initial dose of 100 mg orally followed by 50 mg oral doses may provide better relief. Duration: 2 weeks 4. Chlorpheniramine / Hydrocodone ,4 mg-5 mg:5 mL orally every 4 to 6 hours as needed Maximum dose: 20 mL in 24 hours Duration: 2 weeks Also, please follow the guidelines: Drink extra fluids to help thin secretions and make them easier to cough up. Avoid exposure to allergens & irritants. Avoid smoking. Dry, tickling coughs can be relieved by sucking on cough lozenges or hard candy. For nasal stuffiness, try a saline nasal spray or a neti pot. Increasing humidity in the air helps relieve a cough. Practice vocal hygiene measures (e.g. adequate hydration, avoiding vocal strain, smoking cessation, reducing alcohol, reducing caffeine intake). Please post the test results so that a doctor can follow you up. Please complete the comprehensive treatment. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Dipan Samanta, General & Family Physician