Metronidazole and headaches

I only took 5 400mg metronidazole tablets and had severe lower back pain headaches lightheadedness etc had to stop taking tablets. 2 weeks later still having pain but not so severe. How long does it take for the side effects to go away?

I've taken metronidazole twice in the past year for intestinal parasite. 700 mg, 3x a day for ten days.

I have an awful metallic taste in mouth, dark brown urine, lost of appetite, fatigue, and headaches. Some days are better than others.

I have found that drinking beverages at room temp with out ice helps along with hot food. Something to do with the temp of the food brings out the metalic taste.

I also chew gums and suck on peppermint candy to mask the taste.

headaches, drowsiness..diarrhea after drinking alcohol and dizziness ..all the while feeling unable to concentrate..foggy sort of