Hi! Good evening. I am Dr Shareef answering your query. I do not consider this situation of yours to be anything to worry about. Drinking excess water at a stretch might cause a little temporary discomfort in the abdomen due to fullness and fast over stretching of the stomach. It would be relieved soon once the water gets absorbed, and of course, there could be some diuretic spell. So, do not get worried. As suspected by you, it might be the pre menstrual discomfort only. I hope this information would help you in overcoming your anxiety on excess water intake. 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. I wish you an early recovery. Dr Shareef.