Please just turn him over to rescue. To be perfectly blunt, you purchased Rocky from a mill who was selling him cheap and way too young at 8 weeks. As with many new owners you did not due your homework and purchased on price alone. As
you have said he was bought as a replacement for your fertility issue and his behavior is not what you expected from your "baby". I'm in no way trying to be heartless but he will never be what your exceptions of a baby replacement. You seem to be ill equipped to handle his issues and if you are not willing to accept him as he is you need to do the responsible thing and turn him over to a rescue. I understand and sympathize with your medical issues as they are heartbreaking. Poor breeding, taken from mom and liter mates too soon, his temperament issues sadly will most likely never be corrected. His only chance at a well adjusted life is for his issues to be addressed by someone with a lot of experience. He is 5 months and timing is very important when it comes to these types of issues. Please let me know if I can help with a rescue in your area.