Hi steve
Could be a sugar craving, going by what you are actually eating. Comfort eating can vary quite often as to the food that you eat, when bingeing.
Quite often people who eat mainly savoury foods need a 'sugar rush' so this could be your s r.
As to whether or not it is bad for u in the long term, really depends on how often this happens, is it only once a week? You have to be honest (to yourself) about it.
Some people consume your amount of 'comfort eating' nightly, so this is a serious problem in the long run.
Try to curb eating biscuits say, and eat something you enjoy but "good" for you i.e nuts and raisins (sorry thats one of my favs!)/
Good luck