What happens to a man with klinefelter's who takes anabolic steroid stacks such as 400mgs test-e per week and 20mgs Dianabol per day?

Consultation. You need serious expert advice. You have a baseline condition that effects your natural steroid balance and you are complicating it with powerful additional steroids that will take an expert to enumerate the side effects of. I'm not sure the average endocrinologist can help, but certainly consult a doctor with experience.