Hello Doctor :) Im feeling so tired lately, my bones are weak my muscles are weaker, I burly can hold my laptop bag for 10 mins, i used to be tougher, im 26 yo 172 cm hight, and 87 kg in weight. im over weight but i used to e the fastest when it comes to running, now as long as im walking i keep feeling my bones cracking, sounds everywhere, if some one would push me from the back ill fall down directly for sure... it all happened in a week or two and im sleepy most of the time... i just dont know what to do. please help me to know what is this! thanks