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This is probably strep throat and you will both have to be treated. Perhaps your son's doctor will also provide a prescription for you.
In reading your posting, I was also thinking that the white spots on your sons and your throat may be thrush or a yeast infection . . .
http://www.mayoclinic.com/health/oral-thrush/DS00408/DSECTION=1
I'm not a doctor by any means...just a mother also. Thrush can also cause symptoms similar to what you're describing. I posted a web link with more info above. It sounds like you both will need treatment. Hopefully you've already taken your son to the dr. I've asked my pediatrician a question about myself before - some are willing to take a look real quick and at least tell you if they think you should go to the dr.
Good luck.
the fact your son can't eat is probably strep throat and he should be seen. the pediatrician if confirms the strep may give you a prescription to cover you too if you ask him.
good luck