@Flower8919
Sorry for my slow response re. the coil, life got in the way. 
Unlike other posters, I didn't find the insertion especially painful, but I have annual pelvic exams so am used to a bit of discomfort down there. It stayed put for 2.5 years, then one day, after doing pilates, I could feel that something had moved...felt some plastic and the nurse removed it. I had another one inserted a week later, but that also moved downwards!
Apparently if you lose one of them, you're likely to keep losing them as your body is basically rejecting them. No harm done to me, they just won't stay in place.
I'm the only person I know who's experienced this. Other friends have had them for years with no issues at all. One friend told me that their sex life is amazing since she had hers. Perhaps the lack of hormones has increased her sex drive? 
Anyway, I've read more of the thread and I agree with other posters that you're being pushed into this. Your wife sounds bossy and I don't like the after-work drinks, etc. that she's able to indulge in, while you get few opportunities to have your own adult social life. Could you take up something in the evenings (a sport, hobby?) that would help you meet people?
I'd postpone the surgery until you're sure it's what you want, and if that means no sex, so be it. Condoms are easily available.