I have ENS since 5 years. I developed soon after surgery. I have undergone Alloderm implant surgery without success. The first therapy which helped me was PRP. I cannot say how effective EPO treatment is. Maybe a person without PRP sessions would have had a larger step of improvement. What I mean is that the PRP has already done a lot.
When I would be in your situation, I would try to come down and let me explain everything from a ENS expert and then discuss treatment options.