Not sure if I was coming down with a slight cold, or maybe even some hayfever symptoms (the weather had been quite warm for a few days). Though it was most likely caused by not taking better care of myself - slight ache in the head and tiredness maybe from not enough sleep, minor aches which I'm not sure the cause of, and coughing plus the sore throat that came with it.
Just took a little cold medicine (Lemsip), plenty of water, and got a little bit more sleep. Felt slightly better the next day, but still need to keep up with more sleep and fluid.
Blah, I'm as bad as talking about how I feel physically as how I feel emotionally.