B hicks?

Megan
Hi Moms, last night I started to feel tightening and what doesn't feel like growing pains. Today the same with back pain. Spoke to my nurse and she wasn't concerned, saying its dehydration and to drink 5 bottles of water and take Tylenol. 
On bottle 3 and took two Tylenol, laying down, just feel off. Am I paranoid?? I'm 16 weeks with twins