Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Your problem is most likely due to dehydration, extreme physical exertion, heat stroke, hypoglycemia, dietary modifications, low blood pressure or vasovagal syncope. Consume lots and lots of water starting now. You can use oral rehydration solutions to assist. Try to get rid of your diet plan for now and eat normally. Use little sugar or sweet the next time you feel dizziness, that can help overcome hypoglycemia for now. Avoid caffeine and tobacco related products. Consult an general physician for further detailed examination and appropriate treatment if symptoms persist. Hope I have answered your query. Let me know if I can assist you further.