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

Is a baseline blood test really necessary before starting something like this?

What is the first thing you would read if you were starting from zero?

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

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

How do I find the national register if I do not read the language?