Try these two FREE online veterinary resources www.TheHorse.com and www.merkvetmanual.com - superb sites which have lots of info. Warning - your horses may seem to be suffering from everything!!!!
Funny about that, the websites were more reassuring than the vets this time! GTs is right though - a little knowledge is a dangerous thing - but a horse owner with little knowledge is a disaster waiting to happen!
Veterinary Notes for Horse Owners (Captain M Horace Hayes) has been knocked off the No 1 scary spot by the BHS Veterinary Manual. It's much more modern, too. TIP - Let the vet diagnose and use the books/sites to gen up on the condition. The power of this forum is not to be underestimated either. Lots of useful advice and plenty of support for those 'less than upbeat' moments.