WBW...what a difficult situation you're in! I feel for you.
Everyone here will give you slightly differing advice - because of their own differing personal circumstances, different 'moral stance', life experience and different attitudes!
You feel the deep need to get rid of the total frustration, yet you know you'll have feelings of guilt. You even feel guilty just talking about it, that much is obvious.
But I think in a way, you answered your own question: maybe a quick pump & dump is exactly what you need? A type of girl who will give you no personal connection whatsoever. I'm not suggesting you purposely go for a girl who will give you a bad service, rather someone who will offer the opposite of GFE.
I don't know where you live, but the ideal thing might be a Soho walk-up. Failing that, an average-looking girl with little English but with a 'proven track record' of providing an adequate, basic service.
Does that make sense to you?