Hi Jane,
It sounds like your little guy has an upper respiratory infection such as kennel cough or canine influenza. The antifhistamine and cough medication should take care of that issue though it may take a couple of weeks to recover fully. You can read about these here:
http://www.thepetcenter.com/gen/kenc.html
http://www.cvm.uiuc.edu/petcolumns/showarticle.cfm?id=475
The more a dog drinks the more diluted the urine will become, so if he's been drinking alot you would see diluted urine. At this point, I wouldn't worry too much. If you don't see any improvement in your dog's condition after 3-4 days, then you will want to have him seen again. I hope this helps.
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Thanks,
Jane