Please follow your trainers advise, I would have advised the same thing. Get a hot dog piece or something he would want more than his food, distract him away and pick up the food. From there I would make him earn every bite., Sits, downs, whatever command he will do before some food. And if you can (I know it's harder with raw, but feed every bite out of your hand and progress to holding the bowl, then bowl on the floor between your feet, ect. Yes it will take a while to feed, but it will be worth it in the long run. You want your dog to trust that you will feed him every day, you give him the food, it's yours, but you'll let him eat. Food aggression is a very instinctual thing. I would also expand the training to NILIF for play and everything else you encounter in your daily routing as your dog might try to challenge you in other ways. (guessing here an behavior of his breed and the age he is).
Not to step on anyone's toes here, but I would advise against taking his food away until the next meal, unless you are sure his aggression wont escalate. Taking his food away permanently can reinforce his belief that obviously you can't be trusted around his food so he should guard it. Also I would advise against meeting aggression with aggression at this point. If you are going to challenge him over his food (ie take it away) or claim it, you have to be 100% sure you are going to win at all costs. That means even if your dog bites you, you are still going to manage to grab the food away and disciplined him with no hesitation. Some dogs will back down easily, others will not. It depends on the dog, but not seeing it in person, or knowing your dog I would advise to play it the safe way with distraction.
He could also be a little unsure of everything right now due to the move also you mentioned he is not feeling well, and probably wasn't a few days before you noticed he was ill. (Dogs are great at hiding illness). Dogs will be a little more "prickly" and protective of themselves when they are not feeling well. Its a natural protective instinct of every species.