Thanks for the replies, all. It is beginning to look like I am uniquely unlucky in this respect. However, more input welcomed if anyone else wants to weigh in.
Regarding the smell itself, Loobylou, I wish it did smell like ammonia or sweat, that would be much better. It smells basically like diarrhea but worse. Ides, I hope the smell you got from doxycycline wasn't like this.