How to avoid self harm? (Possible triggers)

[NatalieInProgress]

Hello all,
      Fortunately for me self harm has never really been something that I have struggled with. Recently, however, when my wife is pressuring me to assume certain sexual positions or perform certain acts that I am uncomfortable with, I begin to seriously contemplate castration myself so that she won't be able to make me feel that way anymore. The whole situation is hugely depressing because she seems to think that because I was ok doing that stuff in the past, that I should be able to somehow just suck it up and do the deed. What's more, she somehow thinks that I will enjoy the activity and everything will go back to the way it was at the beginning of our relationship 11 years ago.
     My question is, what techniques have you found that help you to avoid such drastic measures? Right now, my best defense is to try and think rationally about the situation and remind myself that not only might I bleed to death with that approach, but that it would make any hope of undergoing GRS an impossibility. So far this at least gets me past the momentary urge, but I worry that some day, this approach won't be enough to dissuade me.
     Any help or advice you can offer would be appreciated.
Thanks,
    Natalie

[FreyasRedemption]

Well, I've thought of self-castration myself, multiple times, even.
Which is a fancy way of saying, I've almost cut my balls off with a knife more than once.
How did I convince myself not to do that? I thought of all the blood veins that go there, and how painful it would be. Then, I visualized a scenario in which I had done it, and put all my memories and fears of bleeding to work and turned it up to eleven. And then, I reminded myself that if I ever did that, I would be unable to get GRS, or SRS, or anything that would be required for me to become fully female. The main thing that keeps me going is hope. As long as there is even the smallest chance that there is a better tomorrow, I'll do whatever it takes to reach it. To do what I thought of doing is pretty much preventing yourself from ever reaching the future you've dreamed of. And I'm pretty sure your thing that keeps you going forward is exactly the same as mine. Thinking rationally, self-inflicted harm is the last thing we should do, and so, I was capable of getting rid of the thought. It comes back, sure, but the same approach works every time.
What I'm saying is, your approach is right. Rational thinking. But if you feel unsure about if it works, focus on the thought of what you expect from the future. And imagine it not succeeding because of self-made castration. If that doesn't work, distract yourself. Think about something else. I was saved from a massive dysphoria phase by playing video games and watching animated movies every time I felt even slightly bad.
And even though I don't know much about married relationships, or sex, I still know the fact that sex should always be consensual. If both are not enjoying it, something is wrong. If you cannot enjoy it, and it in fact triggers your gender dysphoria, REFUSE TO DO IT. And, if your wife knows, tell her why you can't enjoy it. If you have trouble describing what exactly is making you uncomfortable, tell her to google gender dysphoria. And then show her the percentage of suicides in the transgender community. If that doesn't convince her, telling her about your thoughts of self-harming will.
I don't know if my advice is helpful or not, but it's all I can give.
Keep yourself still in one piece, and remember: rational thought.
I hope I have helped in at least some way.
-Freya