Metronidazole
"I was put on amoxicillin for abscessed tooth and it helped but did not completely clear the infection.  Am on Flagyl now and I feel better than I have in years. Instead of sleeping ten hours a night I am sleeping about six and yet I have more energy than I have ever had.  I feel so good right now that I would like to take this forever.  My fibromyalgia is in remission and the chronic fatigue is gone.  This is an awesome. I wonder if the really bad side effects for other patients is because they are allergic to it, or this antibiotic is just not the right one for the infection that they have (and are they staying away from fermented sugars/alcohol?)."