It can be totally normal for the numbers to go up on the first cycle or two after an increase. (I know...it sounds backwards!!)
We call it New Dose Wonkiness (NDW)
We don't know why it happens, but it's quite common.
It will take several cycles before the "depot" is full and releasing enough insulin back into the bloodstream to equal the new 1.25 dose, so try to hang in there.
As for the not eating, I know you're totally against medications, but if the SEB hasn't helped, I think it may be time to try something stronger like Cerenia or ondansetron for the nausea
Once you have the nausea under control, if he's still not eating, you may need to try an appetite stimulant like Cyproheptadine or Mirtazapine