Hi!
I am very sorry.
We can unfortunately not tell you whether your guinea pig is going to make it just from your post. As you know yourself, your guinea pig is seriously ill and may be going into organ failure.
If you do not have access to an out-of-hours or 24 hours vet (have you googled for you area?), please see a vet as a life and death emergency first thing tomorrow morning.
However, we can help you with some tips what you can do in the meantime:
Please take the time to carefully read this guide link below. It takes you through the various aspects of care with what you have at home or easily available as best as you can to give your piggy as much of a chance as possible (including what you can do if your guinea pig is not making it in time for a vet appointment).
I cannot repeat all the tips in there (which have taken me over a day to write down) in just two easy sentences, but I can guarantee that I have done my best to make the guide as practical and comprehensive as possible so you have some experienced advice available at every stage and at any time of the day and night:
Emergency and Bridging Care until a Vet Appointment
Please step in with syringe feeding as long as your piggy is accepting food. Keep in mind that over 80% of the daiy food intake is hay and not veg, which should make only about 10%. Mushed up pellets will do in an emergency. If you cannot get a needle-free syringe from a pharmacy and cut off the tip as shown in the syringe feeding guide to allow fibre to come through, then use a teaspoon.
NEVER just squirt any food and water into the mouth. If your guinea pig is too weak to swallow, that can easily go down the wrong way.
Complete Syringe Feeding Guide
Make sure that it is as comfy as you can make it. Unfortunately, it is going to be a very long and anxious night for you as you get ideally up once or twice to check on it.
Fingers very firmly crossed!