He definitely is in need of some "rehab" training, and this will take some time to recover from. The poor dog, it is no wonder he is acting aggressive after all that. I am glad you got him neutered, so you are not fighting hormones as well.
Time to start socializing him again as if he were a brand new puppy. Maybe see if there is a beginning obedience class you could enroll him in, if you speak to the instructor and explain. You need to rebuild the bond of trust between you and the dog, first of all, and that would help that.
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