Nic_Hex, tell us, when DO you have orgasms?

I think, what is happening to you is happening in your head. The most common reason for impotence is any kind of stress.
Let me tell you an example from my personal experience:
I am now married almost three years, and now already waiting 3/4 of a year for my divorce. (In Germany you have to wait 1 year before you can be divorced)
Living with my "monster" was pure horror. A very stressing stuff. That caused that I started being impotent. Finally my only way to get off was masturbating in secret. This woman was my way of getting stress. Now, because I am alone already 9 months, all my manpower has come back.
I think your problem is that you cannot relax in the right way. There is a person watching you, manipulating, sucking your most private thing. And your girlfriend is giving you still more stress by not giving permission to suck her out. You say she is getting pissed. (to be continued)

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If every material thing is gone, my smile and my tears stay left.