How do you tell the difference between the drug working and just a good week?

Sorry for the basic question, but how do you actually start one of these diaries?

Followed, this answered three questions I had.

Following this because I am in the same place and have no idea what to ask at the appointment.

Small wins count. Walking to the mailbox is a data point.

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

Stupid question: how do you know whether what is in the vial matches the label at all?