<s>[INST] Last night I woke up and went to the toilet, I am on my period and when I tried to use the toilet a sharp pain came into my right hand side. The pain was so bad it took my breath away and I become clammy and my vision blurred ever so slightly. I managed to get back to bed and lay until it went away (an hour later) today the pain is now in my lower right side in my back. I first thought it was my appendix but I am not sure as the pain is mostly in my back rather then the front. [/INST] Hi ! Good evening. I am Chat Doctor answering your query. From the history and shifting of the pain to your back, without a clinical assessment, the diagnosis goes more in favor of a ureteric colic due to a ureteric stone, and/or a renal pain. If I were your doctor, I would advise you to consume sufficient water along with an anti-spasmodic Chat Doctor.  Further treatment would depend on the results of assessment and investigations. 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 Chat Doctor to clear doubts on your health problems. I wish you an early recovery. Chat Doctor. </s>