Hi
I had gone through your query and understand your concern. "Excess of anything is wrong" but now you need not worry about it and better concentrate on the treatment.
The best part of your case is that its completely curable but don't expect any miracle in a week or two and continue the treatment with patience (at least for 2 - 4 months).
You have made your body addicted to an artificial condition of sex which is far different from the natural condition of real sexual act by the act of excessive masturbation for 15 years continuously. Now what you have to do is to take your body out of the addiction of masturbation and gradually put it into the habit of real sexual environment with your wife. Talk to your wife about it and persuade her to help you to make the process more convenient. There is nothing to be ashamed of because your wife will be awarded for the cooperation later on.
If I were your treating doctor, I would treat a patient with such clinical presentations with the following medications -
* do MEDITATION regularly especially in the early morning hours.
* Don't concentrate on the sexual organs and ejaculation during those personal moments, rather enjoy the moment and you will experience the performance enhancing by itself.
* Take healthy food and say NO to junk / canned food.

* Following procedures will help you -
# Uttar basti with specific medicines
# Matra basti with specific medicines
* Following medicines will help you -
- Saraswat ghrita
- Chaturanan vati
- Apatyakar ghrita
- Dhwajamangal vati
Meeting with a qualified Ayurveda physician for the procedures and before taking any medicine is highly recommended.

Hope this answer will be helpful. Please feel free to contact for any further query.
Warm regards.....
Dr. Ranjeet Sharma ( ramgoday@gmail.com )