Allergies are so weird, everyone is different. I agree it's scary taking any new medication. I had no side effects from Metronidazole after a 200mg dose for three days for a tooth infection.
It is Trimethoprim that gave me a severe allergic response. Hands red and swollen, extreme nausea and exhaustion for 2 days. Slight soreness corner of mouth and slight thrush appeared two days later. Prescribed 6 but only took 2 x 200mg tablets.
Have you stopped buying papers?
Retiring and living frugally in money from downsizing after years of stress


I hope you are OK now.