I've been having lightheadedness, headaches, cold chills and a severely fluctuating temperature. What is it?

Alright, so three days ago I started to notice very brief instances of lightheadedness along with a headache and, later at night, pressure on the back of my eyes(which I ume is from the headache). All these symptoms were mostly gone by the time I went to bed. However, I woke up yesterday and felt the same way with the addition of some cold chills, but my temperature was normal, and in several hours time I felt totally fine. I went out to a movie with some friends, started feeling a bit lightheaded at times along with cold chills, and by the time I got home I had such a sever headache and such intense cold chills I simply collapsed in my bed under the covers and rested for about an hour until my mom got home. She took my temp, and it was 102.1. I took some ibuprofen and an extra strength Tylenol, and in several hours time I was feeling much better with the exception of the occasional cold chill, a much less brutal headache, and the occasional spell of lightheadedness. An hour after that first reading my temperature was 101, and an hour or two after that reading it had jumped down to 97.4. My sleep was quite inadequate, and I woke up numerous times during the night with minor cold chills. By morning I felt much better with the exception of the lightheadedness, and this trend has continued throughout the day. My headache is gone, and the only symptoms I have left are the lightheadedness and a temperature of 100, which by the way jumped up from a temperature of 98.8 from around noon today. My appetite never faltered, nor has my strength. I haven't been more noticeably tired apart from the major lack of sleep I got last night. My mom, a chemotherapy nurse, thinks it's probably just some little bug, but the constant fluctuation of feeling better and worse throughout the past three days along with the major fluctuations in temperature ranging from normal to 102.1 in no particular order is a bit puzzling and, quite frankly is extremely frustrating. Thank you for taking the time to read this, and I will genuinely appreciate any feedback anybody has to offer. Again, thank you.