Thank you for your query would you clarify a few things for me. 1) have you had your thyroid checked for any deficiency ? 2) do you any family history of thyroid disease? 3) about your diet, you mentioned a very particular diet, would you elaborate? have you avoided any particular food groups ? 4) when you urinate, is your urine concentrated ? you mentioned urinating 5 times in an hour, is it a large quantity each time? 5) and history of palpitations for you or heartdisease in your famil? Light headedness, nausea, chapped skin, lethargyall point to dehydration as a common source. Lack of adequate water intake is one of the most overlooked issues which cause subtle and progressive symptoms . If you are physically active and are outdoors, you will need to replace that water by increasing your intake of water and electrolytes. The approximate amount is 2.5 to 3 litres of water a day for a healthy individual, the minimum being 2 litres a day. If you currently do not consume this quantity, gradually increase your intake upto the suggested quantity gradually, over a period of one week. have a few sips throughout the day, don t have it all at once. a good point would be to drink before you are thirsty. Initially you may have increased frequency of urination which will settle down once your body adjusts to the water load. All this is if you are having less water consumption to start with. other medical causes I would like to rule out are anemia and hypothyroidism which can be checked by some blood tests. I recommend a Complete blood count, TSH, FREE T3 and T4, peripheral smear (if anemic), a glucose panel (fasting and post prandial blood sugar) and a consult with your physician for a general exam, and ECG( electrocardiograph) In the meantime, a balanced diet with proper hydration and caution while exercising is advised. hope this helps and you feel better soon. Please contact us if you need further assistance. Wish you good health