Take one to a pharmacist. Free, two minutes, correct. Everything else here is a hypothesis.

Is it normal to feel worse before better? Nobody told me that.

No referral links. Shortened links and tracking parameters are the usual offenders.

Name the active ingredient, not just the brand. It makes these threads searchable years later.

Moved rather than deleted. The reason is in the thread.

Personal experience, labelled as such, is exactly right here. Nobody is prescribing. Currently on amoxicillin-clavulanate myself.

Same here.