Do my symptoms indicate Diabetes insipidus or Period?

I've found that I am excessively thirsty…and I have to drink alot of water..so much so that i keep water bottles by my bed.and Any time I drink water it has to be ice cold. Due to the fact drink alot of water..I urinate frequently…At first I though maybe I had diabetes insipidus..But recently I noticed. That i'm not like this all the time and and thios tends to only happen about a week before my period is due to start. So i as wondering 1)if someone has diabetes insipidus are these symptom that would occur all the time or only sometimes as it does in my case.2)Is it possible this could be due to my period.
**I know i should see a doctor. But I have no money or insurance..I will once I am able