giardiasis
"On day 7 of 10 of taking Metronidazole and i still feel like shit! Being treated for a parasite that was making me feel awful but not this awful! I know in the long run this will be beneficial as the parasite will be gone however, taking for ten days is exhausting. I have had to take the entire week off work. Side effects include stomach pain, nausea upon movement, brown urine, back pain, fatigue. And the foul taste!!!! People really haven't exaggerated the taste - it is vile and constant! Can't wait to be done!"