I want to start off saying I dont know the history of you or your dog so what I say might be redundant, but have you tried another trainer or at least get their perspective? Every trainer is different and maybe the one you currently have just doesnt quite work for your dogs personality Even with positive training every trainer is different. Their personality can strongly influence you dogs training. For example, if your trainer feels even a tad anxious during training your dog can catch on to it even if you or the trainer doesnt notice. If it were me I would do my best to hold off until you see a behavioralist. Maybe theres some outside your area? Again I don't know your situation and really you are the most knowlegable person to make the decision.