I do the same......diet.....fall off....stop weighing myself........gain weight....then restart.....and weigh daily......wish food wasn't such a struggle.
^Have you ever considered low carb/keto eating? Intermittent fasting?
If you're having blood sugar spikes all of these are now regarded as very beneficial for that and a) weight loss b) pre-diabetic - preventing progression to type II c) type II diabeties - returning to non-type II diabetic d) stablising type I diabeties d) metabolic syndrome. e) reflux & gastro issues.
I'm not trying to say this is what you should do. When one eats carbs then the craving for carbs is perpetuated. In fact carbs are quite addictive. Even simply doing the intermittent fasting may help. :)