I would wait till he is well again before changing things up. I nearly went bonkers with DS between 27-29 months. Went from dream sleeper to screaming and crying. It did not help that he started 2 hours of play school then too. It just put in more variables.
I got so desperate that I even started playing ocean waves and forest sounds in my car to chill him out on our drive back from play school
Worked for a day or two and back to nonsense again. I finally gave up when Hena wrote her DD had a developmental blip then too. I just kept being consistent and voila, he went back to normal at 29.5 months and started making sentences like crazy! But his A time did require an increase too as he kept waking at 45mins crying. Not tired enough to transition but too tired to wake up happily.
So yeah, let him get better and then evaluate again.