Do you contact the customs office or the carrier first?

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

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

What do you do about the fee? Do you just pay it?

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

Do you contact the customs office or the carrier first?

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