Thigh cramps - some analysis from physician

Last Saturday, at about 0230 hrs I got up from my mat and immediately I felt severe pain in both thighs at same point. The pain was so severe and for 1st time in my life my mind was totally blank and was unable to do or think any think. Just I walked here and there for 15 minutes in the house by which time it started subsiding. Next day being Sunday, I could not contact any of our official doctors. On Monday, I met my physician with the problem which was still persisting to some extent. He told me that this called cramp and not pain as there was muscle contraction like where as pain means it is present continuously. Then the reason for the cramp could be loss of salts (Na, K chlorides; hormone change, thyroid problem, sugar levels). As per his advise I underwent some tests also. It appears to be TSH which is above permissible levels. I am yet to contact the doctor with the report but a search in the internet shows that failure of thyroid can cause such levels of TSH released by pitutory gland.
In this entire episode, one thing I noticed is that for last few weeks because of higher temperatures outside, I am drinking more water 4-5 lit a day and this also brought down my food intake by more than 50%. More water means more urine and this might have caused loss of salts also as it is mentioned in some articles that excessive water drinking can lead to water addiction with the resulrt of loss of salts. I might have been subjected to such loss. But, medical tests show electrolytes in normal levels.
The doctor advised me to take glass of water with electrolytes once in two hours or tender coconut and whenever I go out he advised me to take water with atleast some sugar and salt added instead of plain water.
Summer safety tips are therefore useful and we can understand only when are subjected to the consequences.
I thought my experiences will be useful to some body and therefore this POST.