I feel that if I punish myself enough make myself feel bad keep myself in this low position then my W would ultimately see how sorry I am and would eventually change her feelings back towards me
If I remember correctly, you have apologized to your W, and put forth effort to show your sorrow. The DB coach is right, your W's feelings could change. In order for her feelings to be good toward you, she needs to see you lifting your head, standing tall, shoulders back, and speaking with confidence. These are positive male body language that attract his W. Not the beaten down dog who slips around with his tail tucked between his legs.
I hope you will follow the advice and support SH is giving you.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!