Did they do a strep test? If it's strep and left untreated, it could progress into some pretty nasty stuff for adults, spread to other parts that you don't want it spread to ... and it can be quite catchy, too, so if you can keep him away from others, that would be good. However, it may be too late for that. Can you call the doc back and ask for a different antibiotic because you can't afford the one he prescribed?
Does your husband have a fever?
What works for little ones can also work for adults. Besides garlic, echinacia and goldenseal formulas are usually quite effective at giving strep the heave ho. Got any yin qiao on hand? How about apis mel? phytolacca? If you don't have any of these on hand and you have to go out and buy the remedies, it might be worth it to put that money toward an antibiotic. Just a thought.
Will he drink a tea?
I sincerely doubt that Our Bodies, Ourselves will help your poor husband.