Unquenchable Thirst?

I started my period yesterday and along with that (later in the day and last night) came the most unquenchable thirst no matter how much water I drank. I also felt like I was kind of in a haze. I have never had this happen before. I woke up today and feel the same way. I am terrified that this could be diabetes (no!!). There is no history of diabetes in my immediate or extended family whatsoever. I do have high cholesteral (but low blood pressure) for being only 26. I also quit taking 20mg/day of celexa cold turkey about one month ago. My doctor knows about that. I'm not sure if these things are relevant, but thought I would add them. Do you think this is diabetes or could it possibly have something to do with sodium and my period...? I am just beginning aviation training. Having diabetes would disqualify me from flying professionally. Has this happened to anyone or can anyone ease my worries and give me any other possible reasons for this quick onset of constant thirst?