I have cotton mouth and a feeling of uforia and I am drinking water constantly and lying on the bed I do not drink or do drugs what is wrong

NO ONE online can possibly know what is wrong.
Where in the world do you live?
How long has this lasted?
Are you diabetic?
Can you get to a doctor?
Are your kidneys OK; are you urinating?
Is your water supply safe?
Can you swallow OK?
Are you on any medications?
Is the euphoria a feeling of extreme well-being, or more lightheaded and slightly dizzy?
Is your area known for parasites?

If you can get to a doctor today, don't bother answering questions. At least can you call one today.

I live in the US in the state of Indiana
About midnight Friday
Don't know
I have only go twice today
Have a doctors appointment Monday
Yes it is safe
Yes I am on meds one of the is furosemide 40 mg two tablets twice a day and that keeps my legs from swelling
Mor light headedness and slightly dizzy
No it is not known for parasites

Wait until Monday unless anything gets worse, including swelling, high blood pressure if you measure it (I bought a cuff for about $15 on ebay), and don't drive.
Eat small meals and avoid sweets for now.
You can always call the answering service, or go to an ER. You could have diabetes or an unusual reaction to furosemide. You say 'one' so what's any others? ALL MATTER

I AM NOT A DOCTOR. It's possible that you should go to an ER, but that's the cautious approach. You've had it one day, tomorrow is Sunday, the ER will be crowded, and it will cost 10 times as much.