If you're switching from low carb to a higher carb diet, please realize that anywhere from 3-8 pounds regain is normal. This is
not fat! This regain is simply glycogen stores and water in your muscles. When you're on low carb, your glycogen stores are low or non-existant, when you begin eating a higher percentage of carbs, you have glycogen stores again.
Remember back to your first and maybe second week of low carb--you probably dropped an absurd amount of weight, and then began losing at a regular pace after that. The reason you dropped so much in the first two weeks is because you were depleting your glycogen stores and with the gylcogen went some water in your muscles, too.
Don't be afraid, just accept that the number on the scale is going to go up a few pounds when you get off of low carb--it's not fat. Accept that as your new 'now' point and go from there.

If you're just switching over, your body is replenishing its glycogen stores and getting used to using carbs as fuel again. Any diet change can also cause you to retain fluids--give it a couple weeks to stabilize. If you don't like low carb, then don't do it! For some people (like me), it works and for the most part, we like it! For others, it's really not sustainable.