I work outside all day in the heat and i have been feeling lightheaded could it be affecting the pinched nerves in my neck more? or what could it be?

Blood pressure?: There could be several reasons as to why you are feeling light-headed--especially out doors. The Florida heat and lack of good hydration may be contributing. Also, if you are anemic (or pregnant). Certain medications can also contribute to feeling light-headed. If it persists, you may want to check with your doctor. Best of luck.