When you have a lot of extra weight to lose, dropping 2-3 pounds/week is feasible, but when you're just barely overweight, your body is going to make that very hard to do. It is normal for your weight loss to slow down as you go, because the less you weigh, the fewer calories you burn doing all the same things. It's OK. I think for your health and your peace of mind, you might want to consider revising your goals a bit or at least be flexible with yourself. Also, your body will only metabolize fat so quickly. If you starve it trying to speed up your weight loss, you'll lose more muscle than fat, not to mention you won't have the energy to exercise.
So the short version: it might be more reasonable to plan on losing about a pound a week from here on out. You might try gradually raising your calorie intake to about 1500/day on average, but that's assuming you count carefully. More exercise wouldn't hurt either.
It's good to have goals, but don't let the scale take over your life. You'll look great at your daughter's wedding whether you weigh 150 pounds or 160 or even 170. Don't let a missed goal put a damper on all the wonderful things you have going on! You can always take a deep breath and start over with a new goal.