I'm a 16 year old girl from the UK and over the past couple of weeks I've been experiencing tiredness, headaches at the front of my head and behind my eyes and a general loss of appetite. I get plenty of sleep as I have left school - I always get at least 8 hours. The headaches seem to come on randomly and are between mild/moderate and don't go away for extended periods of time. I suddenly don't eat much, even though I usually eat big portions. I have a perfectly healthy BMI weight (21) and do exercise in the form of dancing and generally eat healthily.
However, because I left school, I don't drink that much water anymore, but I make up for it in tea and apple juice. Am I suffering from dehydration? Or could it be something else??