Will i gain all my weight back?

call me nuts but i have lost 60 lbs over the past year, and i am extremely afraid of gaining my weight back. i got to the gym every weekday for at least 1 hour. and i eat fiber one/kashi cereal for breakfast, tons of apples, 1% baby carrots, oj.... turkey chicken and tons of veggies. my only weakness is ice cream, which i either get Only 8 froyo or the weightwatchers/smartones stuff. i drink water/crystal light/tea with lemon black. my ? is this.... if i add sugar to my tea and relapse a little on my diet with i gain weight back? b/c honestly I am a little neurotic . my usual meal EVERYDAY is this mix of fiber one and kashi cereal with 1/2 cup 1% milk, apple, 1 cup ww oj. snack - fiber 1 granola bar of kashi TLC granola bar lunch smart wrap w/ turkey, laughin coww cheese, tomatos, spinach with baby carrots and salsa for dipping. snack - granola bar. preworkoutsnack apple/banna/fruit. dinner - perdue perfect portions chicken with some type of veggie. ..... im just nervous b/c i feel like i am eating so much, but yet everyone keeps tellin me that i look thinner and thinner. as of now i am 112 lbs and 5'3. i was up to 167 lbs. whats your opinion on the situation? am i nuts or what?