So last night my knees where achey and down right hurt all night. Surprised I even went to sleep. Nothing helped them! I woke up feeling great! But I started moving and doing laundry and my elbows now have that same achey pain feeling. I still haven't had my period yet but it's common for me to not get them and every hpt I took its been negative. What could this be?! Please help! I'm so uncomfortable!