Hey abaya, I really liked pig's post. He said with eloquence what my Lady said when I mentioned this thread to her.
Points that got mentioned were - that all grad students go through this, it is part of the Phd process. Really consider the sunk cost - that is, you have a huge investment that with some more time will garner the permanent result that the rest of the world can recognize in a flash, which is your final degree. This isn't like a gambler throwing money on the table - you can definitely get your result by putting in your time.
Is there a way to farm out the number crunching? In my mind having a number guy do that work is a bit like getting people to collect data while following your guidelines. If you have a statistics guru run your numbers, and you take the resultant refined data and analyze that to the results - is that not acceptable in the world of Phd thesis writing? People write papers while utilizing the skills and training of others all the time - editors, guidance people, you name it. I would take a hard look at finding a numbers mechanic because it is your major stumbling block.
You really need the community of like-minded scholars to help you over this hump. Take your husband's offer and run with it, get yourself back to the States and finish things off at your own pace.
The last thing is this statistics turn is not where you want to go. Somehow you have wound up in a numbers jungle and it will take a slog on your part to find your way back to where you want to be. IMHO the slog is worth it because in the end having the Phd as part of your arsenal will garner you more. You will have gravitus, weight, you will be accorded more consideration because of what you evidently were willing to invest in in order to get that final degree.
I have quit a marriage after 25 years, and a job after 23 years. It was a long hard go, and at the end it was definitely time and past time to quit. But I am also glad I hung in because the job and the marriage both really got the old school try. No regrets about not giving those worthwhile things every bit of available energy and work before I finally hung up my hat
Enjoy your Spanish interlude. Take some time to look around even if it only can be half a day. That is time spent that you will never regret
My 2 cents.