I noticed you just started Atkins recently...my opinion, a sweet potato would NOT be a good choice for you at all! Most restauants will substitute steamed veggies (avoid carrots) or even a small side salad (avoid croutons, carrots, have dressing on the side--oil/vinegar or blue cheese are usually OK) instead of the potato or rice.
Stick with things like steak, broiled sea food, baked chicken, etc...nothing with breading. Ask that bread not be served at the table if it's too tempting. Just basic things that you might eat at home. Keep it simple. After all, going out should be about having fun with the company that you're with...not mostly focusing on the food that you eat.
If we are facing in the right direction, all we have to do is keep on walking. ~~Buddhist proverb
Absorb what is useful,
Discard what is not,
Add what is uniquely your own.
You don't drown by falling in the water...you drown by staying there.
There are only two options: make progress or make excuses.