Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Causes of giddiness after exertion due to cradiac failure or hypotension or anemia or vestibular insufficiency etc. Until examination is done it is difficult to say what it is. Posterior circulation stroke may also present like this. Avoid spicy food and alcohol avoid smoking and caffeine drinks. Use tablet Vertin 16 mg thrice a day for five days. If symptoms not improved please consult your doctor he will examine and treat you accordingly. Hope I have answered your query. Let me know if I can assist you further.