Doing manual labor or exercise - in balance - shouldn't make you feel dizzy, unless something else is wrong. If you're breathing properly, moderate amounts of it can actually be strengthening for the body, like the benefits weight training and aerobic exercise provides.
However, feeling dizzy is a symptom that can also stem a.) from vitamin / mineral deficiencies - like anemia, which is an iron deficiency, or B-12 or vitamin A deficiencies, or can also stem b.) from dehydration or low blood sugar because you're not properly eating or balancing your salt/water intake or c.) from more complex ailments stemming from stress (Adrenal Fatigue and Adrenal Exhaustion - see http://www.DrLam.com for more info). If you don't balance your system and your habits, though, your symptoms can get worse and progress to much harder-to-fix complications.
In the case of a vitamin/mineral deficiency or anemia, your doctor can conduct a standard blood panel to determine if this is the cause. If you're dehydrated or have low blood sugar, you can eliminate your dizzy spells by drinking 8oz of water 8 times a day and eating properly balanced, natural and low-complex-carbs meals, and avoiding refined sugars.
However, most mainstream physicians are not yet up to speed with the subtle, counter-intuitive and subclinical nature of Adrenal Fatigue or Adrenal Exhaustion, so many can make mistakes like prescribing meds unnecessarily. To rule out Adrenal Fatigue, be sure you see a doctor who specializes in it.
Continuing to do your research and learning possible causes will help you find the right answer.
You may also get more helpful information here if you provide more information about your age, level of daily activity, diet habits, exercise habits, and information about any other unusual symptoms you experience.
Good luck finding your cause and restoring your natural health!
Answered Dec 07, 2012
Edited Dec 07, 2012