Way too much lemon in my basting liquid
It won't look as nice, but it should be possible to rescue the flavour. 

As you've also got lemon in the filling, and feta is quite tart as well, I suggest you first remove the filling and dilute with extra cream cheese (and possibly olives and cooked garlic). Reheat enough  to have with the pork and chill the rest too have with something else within a couple of days.

Wipe the meat with kitchen roll (paper towel) while the filling is removed. If you're desperate you could even quickly rinse it (in boiling water if hot, chilled water if cold).

Then reroll and reheat, or serve deconstructed.