My kitten throwing up green liquid and not eating anything?

I have 3 kittens. All nearly 6 months old. Their mother was 1 year 7 months old , she died yesterday. She was vomiting , not eating and only drinking lots of water. She pooped a little at 3am which was bloody and it had two long worms. She died in my arms at 8am😞i am devastated by that. Now my kittens are all Lazy sleepy and not eating only drinking since morning. It has been 1.5 day since they have eaten. One of them vomited green liquid. I took them to vet he said they Have 104 fever. Gave them injections and medicine. I gave them medicine again tried to feed they didn't even eat their favourite food. The same kitten again vomited green liquid just now even I gave them medicine. Vet is extremely far away and expensive here and they don't resolve the issue till multiple visits. Anyone please help me out I'll be greatful.

Medicine doctor gave:
Digas syrup
Flagyl syrup
My kitten throwing up green liquid and not eating anything?
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