Hi! Good evening. I am Dr Shareef answering your query. From your history, it seems that you have got some kind of infection in your abdomen which is causing you pain and might be fever due to which you are feeling week and your muscle aches. However, it would not be possible without a clinical examination of your abdomen along with the ultrasound report to diagnose the problem. Therefore, I would advise you to see a general surgeon along with your ultrasound report for further management. Till then, you might go for a proton pump inhibitor and an anti inflammatory drug for a symptomatic relief. I hope this information would help you in discussing with your family physician/treating doctor in further management of your problem. Please do not hesitate to ask in case of any further doubts. Thanks for choosing health care magic to clear doubts on your health problems. Wishing you an early recovery. Dr Shareef.