Lately I have been extremely tired. I can sleep 10 hrs a day & Still feel like I've been up all night. I just had my period so I don't think it's preg. related. I have head/back/body/neck pain constantly & feel sick to my stomach. When I feel like I have to throw up, it's basically stomach acid that comes up. I sometimes feel shaky & off balance. I have been under a lot of stress lately but not sure if that is the problem. Just wondering if I can get opionions on what people think it could be-just a basic cold/flu thing or if it's something I should get checked out for something more serious? 