Update: Reading all your comments below made me tear up. Thank you guys for being so kind and so supportive with the whole situation. I never grew up with any pets so Shrimp and Udon (my other guinea pig) are my first pets ever and so this is the first time I'm experiencing this type of heartbreak with a sick pet. Initially, I had another vet appointment on Saturday but scheduled another vet appointment for Thursday instead and also with a different vet in hopes that they can actually find out what's going on with her. Thank you all.