I was just on a low carb diet and was constipated. Since ending the diet, which lasted a month, my gas has smelled really bad. Will it get better?

Not necessarily. The gas may be from one of the foods you are eating. Try eliminating one food at a time and see if gas goes away. If it does, try the food again to see if it comes back to know for sure.
Probiotics. You may need more probiotics and more fiber in your diet.