I am one to run for the asprin or whatevers handy with a fever since its the aches and pains that come with that really bother me.
I did look up natural remedies for fever and maybe something on this page will be more helpful to your husband. I do know to encourage drinking lots of fluids, water and juice are best.
Heres a link to information about natural remedies and things you can do without taking tylenol or anything like that.
possumsal.Homestead.Com/fevers.Html