Did your Tableau Service start after adding the worker? you may check this by typing "tabadmin status" after navigating to Tableau server installation path. In my case it would be D:\Tableau Server\9.2\bin>
Please share a screenshot of Tabadmin status command output
Your filestore and repositry is not even available on Primary. Was it working fine before adding the worker? Primary is degraded. so you cannot login.
Check this link as well
Try Tabadmin Restart
If it doesn't work try below
Do you have a back up taken (important)?
If yes, attempt to take off the worker and test if all is fine just on Primary.?
If yes, follow the steps in the below link to add worker which I assume you previously followed
The below link may also be though entirely not applicable to your current configuration but I thought you should know this as well