Your PSA is still very low and remember, it can move around a bit even at very low levels.
That said, it is completely unnerving and anxiety inducing when you see this number start to rise.
As you’ve indicated, the presence of cribriform and IDC does put you at risk for recurrence; so you should probably be placed on a 3 month PSA testing interval to see if there is meaningful change in your PSA, as well as the PSA velocity, which is key.
Usually, no treatment will be instituted until you reach a PSA value of .2 but if it is clear to your oncologist that BCR is occurring you can start treatment sooner. ADT would be necessary as well as salvage radiation.
The salvage treatment should not be feared - IMO, the anxiety of waiting (and projecting) is far worse than anything.
Phil