Signs of dehidration
Im not giving Medical advice, I just looked this up on the internet and thought you could have some sort of guide, your best source though would be to call your surgeon or go ahead to the ER and be checked out I wouldn't wait around but that is just my opinion. Hope you feel better soon.
Here is the address about dehydration (symptons):
http://www.revolutionhealth.com/conditions/first-aid-safety/first-aid-treatment/dehydratio
n/signs-dehydration?msc=S49558
Signs of dehydration
1. dark urine with a strong smell
2. Tongue has white coating
3. decrease in saliva production
4. dizziness/lightheadedness
*Try ice chips and teaspoons full of H2O.
*Stay away from caffienated beverages, caffiene is a diuretic it will make you urinate more
* suck on popsicles
*Juice will only make you thirstier, water is best!!!
When in doubt call your doctor
Good Luck