If she has an infection then its really important the she gets onto some AB's straight away.
If she's as sick as you say she is then its really important that you get into see a Dr ASAP. Whether it be a GP or the hospital.
Can you ring Ryan and ask for the car back? Can you get a lift with someone? Can you get someone to watch the boys whilst you find your way to the Dr's with her? Can you call a home visiting Dr?