Kesimpta loading doses

So I’ve had 2 of the 3 doses, my last one being due this Thursday and I’m hoping for some info on symptoms flaring up and a bit of advice.
I ended up having a relapse in May and developed optic neuritis. Had my IV steroids and most of my vision came back within 4 days. However just over a week later I had my first shot of Kesimpta and the vision in my eye is blurring quite badly again. MS nurse thinks it’s the injection combined with the heat especially as there is no eye pain now. Has anybody had experience of this and if so how long does it take to settle again?