Hi
I am very sorry.
Please follow the advice in our gut problems information thread link. You should find it very helpful. Please accept that we cannot give the complete information in all details in every single threat - seeing that it takes me days to write a guide, make sure that it is clear, complete and that any medical advice is checked and sound. We can give you a few tips, but the actual step-by-step details are in the guide links. Please take the time to read the information so you can judge better what you are up against and what you need to do.
Here is the link:
Digestive Disorders: Diarrhea - Bloat - GI Stasis (No Gut Movement) And Not Eating
No veg, as much hay or recovery formula as possible (mushed up pellets are an emergency bridging measure since their fibr content is a lot lower than that of hay). Supplement with probiotic support; fibreplex for single piggies, poo soup for piggies with healthy companions to help the healthy gut microbiome grow back and the wrong kind of bacteria that has taken to die down again (dysbiosis).
Guinea digestion is laid out for hay, so feeding as much of it whether by itself or by feeding top up is crucial. Don't worry about vitamin C; hay contains, any recovery formula and probiotic products are all enriched with vitamin C.
Probiotics, Recovery Foods And Vitamin C: Overview With Product Links
You control any necessary fibrous syringe feeding support (timothy based recovery formula) by weighing daily in order to control the independent food intake and to know whether or how much you need to supplement during the acute crisis and recovery phase. You cannot judge the independent food intake by eye, so the scales are your best friend.
Weight - Monitoring and Management
Complete Syringe Feeding Guide