Think we all have had oops know I have . Sorry for the trouble .
I have found some plants do not like neem I used it on a thin leaf one and it did about the same thing .
For knats the yellow sticky cards work well or if like me, a cheap skate, the regular fly paper strips available at the box stores, they are gross but can be hidden . I got some of the sundews and butterwort bug eaters the knats are gone. I keep them around the Phrags.