I'm 25 years old, for the last 3-4months I have been having night sweats which started occasionally but it now pretty much every night, requiring me to have to get up and change as it's soaking (sorry if TMI). I have also lost some weight without trying (previously it has been very hard for me to lose weight). I wake up every morning with a headache across my forehead and sometimes nausea. I am exhausted to the point I could continuously sleep for 12+ hours and then nap through the day. At work I sleep on my breaks just to function. I've found a small lump under my armpit, one under my colloarbone and in my breast. I have also had some unusual breast discharge which hasn't happened before. I have a doctors appointment next week and I'm so anxious. I have no relevant past history and am not pregnant. 
Any suggestions as I can't get it out my mind?