You could well be talking about my black lab, Joseph!! (without the reactivity). I understand the upset, and the 'helplessness' you feel, BUT he can be helped, he can get better. We lived with Joseph's 'bull in a China shop', food obsessed, behavior for a long time, until we figured out that he needed to 'think', to use his mind, he loves to learn. I referred to him one day as a brilliant child who was bored beyond words, didn't know what to do with himself, so he chose inappropriately, had no self control.
Understand that an anxious, over excited or stressed dog cannot learn, they are not in 'thinking' mode, they are just 'doing', there are a few things you can try to help calm him, Rescue Remedy can work, DAP (dog appeasing pheromones) can also help, 'aromatherapy' - lavender can help, to calm, enable the dog to focus.
The 'turning point' for Joseph was introduction to 'brain games', which also made his food obsession an advantage, mental stimulation was key, ie: 101 Things to Do with a Box | Karen Pryor Clicker Training
and a focus for his energy, agility, fetch, find it, working on impulse control - even 'resting' on a mat is hard work for a dog, 'leave it' take it. Teaching tricks, rehearsing and rewarding know behaviors, teaching new skills, all added up to a much calmer, 'sensible' dog but I think (in hind sight) it was the one-on-one attention, focus, and working with him that made the difference for him.
Something to consider is the more they misbehave, the more we withhold our attention, when we ignore their need for attention and guidance, the harder they will work to get it, they 'need' us to pay attention to them. They learn quickly that being 'naughty' gets our attention, being 'good' is not rewarding for them, gets no attention at all. Take the time to look for, notice, acknowledge, and reward the 'good' behaviors that he offers. Will he sit for a split second, reward it, will he lay on his bed, or a mat? reward it.
I totally understand where you are coming from, the others were so 'good', he seemed to be so constantly 'bad',/frustrating, but the more time and effort we invested in him, teaching him 'how to behave' the more often he was 'good', and from 'good' he has moved on to being an absolutely wonderful, easy to live with, best friend.