Hello and welcome!
I am sorry to hear of your recent struggles with returning anxiety. :/ I know how challenging this is.
Everyone is different, but I would say that it does take most people around 6+weeks...and nearing their therapeutic/target dose to experience relief from their Rx.
The use of your benzo is a good idea during your start up...
...and also seek to learn new coping skills
to help you further...and put into regular practice once you are ready to wean from the rescue med and only have your SSRI.
The link to our Resources
are at the top of the main forum page here...and is filled with great material that you can get started with right away.
Post with us anytime for sharing and support. We care, understand and will be here anytime to listen!