Hi there - well, first, I'm sorry for whatever emotional turmoil is causing you to do this to yourself. You clearly are aware that this isn't "normal", nor is it good for you.
No one here can tell you the extent of damage you might have already caused, nor the extent of damage that will be caused if you continue. Suffice to say that nothing good or healthy can come of this behavior. Yes, you could do permanent damage to the nerves and vessels in your penis, and you could have life-long issues.
You should, as a matter of urgency, seek therapy. Every time that you do this you are putting yourself at more risk, so seeking help should be your top priority. If you cannot get access to immediate mental health services, I suggest visiting the emergency department or an urgent care facility. They can evaluate the damage and help you with behavioral resources.
Best of luck.