Hi there, I have a sick rat terrior and don't know what to do!!!

[chiefmet 6]

She started getting sick today, and has been trying to vomit on and off all day. Her eyes are really running and she acts as though she has sand in them, ( they are really squinty looking) When she drinks she acts like it either taste bad or that it hurts her. She keeps chewing at her hind leg, but I can't find anything. I was afraid that she had been snake bitten but see no signs of that. We are to go the the vet in am, but just wondered if anyone had any suggestions. Also she keeps rolling her face in the grass like she has something on her, so we gave her a bath. She is normally a very active little dog, BUT NOT TODAY!! Annie loves to play soccer and is not even interested in that. Hope someone has some ideas. Thanks