I took it successfully for many years. 80mg 3 times a day for a week followed by 40mg twice a day then once for years. Dropped to 20mg at night. Until we went into lockdown then I stopped completely.
'valium' as necessary worked in the 1990s. Now I have an emergency tablet when anxiety floors me. By 3 weeks U should feel some benefit I would have thought, mayB ask if you can add 20mg on alternate evenings? When is the anxiety worse for you?