I am not a doctor but two of your symptoms did stand out to me. I wanted to comment based on my own health experiences.
Frequent thirst is often a symptom of Diabetes. As part of you lab work make sure you have a fasting blood sugar test as well as a test called an HBA1C. These two tests indicate how your body is utilizing insulin to regulate blood glucose levels.
The sudden sharp pain underneath the left part of you body by your ribs could indicate problems with your gall bladder. Those are similar symptoms I had and then had to have my gall bladder removed.
Holding off running would be a good idea until you get an accurate diagnosis and effective treatment plan from your doctor.
The opinions expressed in WebMD Communities are solely those of the User, who may or may not have medical or scientific training. These opinions do not represent the opinions of WebMD. Communities are not reviewed by a WebMD physician or any member of the WebMD editorial staff for accuracy, balance, objectivity, or any other reason except for compliance with our Terms and Conditions. Some of these opinions may contain information about treatments or uses of drug products that have not been approved by the U.S. Food and Drug Administration. WebMD does not endorse any specific product, service or treatment.
Do not consider Communities as medical advice. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of something you have read on WebMD. You should always speak with your doctor before you start, stop, or change any prescribed part of your care plan or treatment. WebMD understands that reading individual, real-life experiences can be a helpful resource, but it is never a substitute for professional medical advice, diagnosis, or treatment from a qualified health care provider. If you think you may have a medical emergency, call your doctor or dial 911 immediately.