Want to mention really quick that I think we have to respect how unsettling it is to gain ten pounds. We could sit here and say, "You're doing great, just fuhgettaboutit!" but seriously, I think we would do better to admit that without further information, we have no way of knowing whether someone is in weight gain territory. Do we honestly want her to gain 20 pounds before we say, "OK, there's a decent chance that you need to adjust what you're doing!"
Honestly, I would have a freak-out if I gained 10 pounds in one week. Fine, maybe it is not ten pounds of fat, but who cares. Even if it is 4 pounds of fat, plus 6 pounds of water retention, the end result is that my body is ten pounds larger and heavier than it was before I started "improving" my health. And if you have a brain in your head, and you do the math, you know that if I gain ten pounds the first week, then if I continue eating like this, then maybe I am up 12 pounds after week two, and up 14 pounds after week three. This is not what the original poster wishes for herself, and I never want to pooh-pooh that or dismiss these concerns.
Everything that has been said here (especially everything said by Ltldogg) is right on point, so I don't want to bore you by saying all the same things all over again.
I would only add that you are probably doing a ton of things right here, and to feel good about that, and build on that. I'm surre you've had a lot of huge wins -- putting pieces in place that will wind up giving you a lot of excellent health over time. Did you eat some fresh tomatoes that tasted wonderful and made your body feel really healthy? Did you bring some apples with you when you ran errands so that you could sail right past the starbucks without stopping? Did you enjoy some unprocessed starches and notice the feeling of satiety you get? There are lots of small rewarding wins, and you have to acknowledge those and give yourself major credit, otherwise you will (foolishly!) say "This week was a big fail. This sucks. Why did I bother."
I'm not at all a fan of scale-centered eating! If you think that giving your body whole natural foods is only worth doing to make some fat in your upper arms go away, then every carrot you eat is going to feel like a form of punishment. You're not punishing yourself. Your thighs are not anyone's business really, and they don't certainly don'e need to be punished. A way of eating that is centered around punishing your belly fat pretty much sucks and I don't want to see anyone live like that. It is not even NICE!
Can I convince you to target things that you WOULD like for yourself? Being able to walk farther each week than you used to, is something that feels good. Or, being able to see bloodwork that shows that your engine is running clean and will not break down on the side of the road, is another thing that feels good. Or, feeling GOOD about the foods you're choosing and having a healthy relationship with food, also feels REALLY good. Your weight will shift as you eat whole natural foods, and we want that to happen for you, just not from a place of desperation or neediness.
That's all I've got to say! hope something is useful.