Tips for dog that has scared aggression, almost a Foxhound Beagle mix.

My male dog, J, gets aggressive when he seems scared. For example, when he is sleeping or dozing off, he may react aggressively if a person or another animal comes near him or jumps onto the area where he is lying.(both seem to be when he doesnt really notice) My main concern is recently we had a family friend (Jessie) thats a vet come over, because his dewclaw was broken at a weird angle and needed to be taken off. During the struggle of getting him to stay still so Jessie can look, he ended up giving it a clean break by himself. Jessie had wrapped his paw/leg and then went to put a liquid medication in his ear because of an infection. Well, J never likes his ears being touched (even before the infection) during the process she had to put a muzzle on him because he was starting to panic and get aggressive. That wasn't enough, and she had to completely restrain his legs and keep him still so we could get the medication in his ear. The process was very rough to watch because of the state of panic he was in: Involuntary anal gland release, Red eyes, Excessive drool, Panting, Whining, pacing, and hiding. Is there any better way that he can get the treatment he needs (in a short time) and without him being this scared? If there are any fast working tips id really appreciate it, and if theres long term tips I would greatly appreciate those aswell.