Hello! I'm recently sixteen years young and I've been experiencing some... rather strange symptoms. And it's not just recently. It's been going on for the past... four or five months? I haven't the slightest clue why. My dietary habits are similar as they've always been.  I've continued the same routine as before... Well, aside from the fact that I'm not playing volleyball for this season, but I'm going back in two months. And that wouldn't change much, since I've only been playing for a short amount of time anyways.Anyways, everyday I do the same thing: get up, yoga or Pilates, shower, toast and orange juice for breakfast (for most occasions, since I'm in a rush to get to school because my sister takes forever to get out of the shower), and we go to school. I also drink iced coffee or green tea in the morning.I'm tall, five seven, and usually maintain a weight of about 135 pounds, at most. But for some reason, I've gained weight. I'm at 150+ pounds now, but everything is the same as before. To add to the extreme weight gain (and occasionally, extreme loss where I go from 154 to 147 in an hour, which has happened to me before), I've become rather light headed, bloated, nauseous, dehydration, dizzy (in addition to my light headedness), and there's been a tightening in my stomach. At school, which is eight A.M. to three sixteen P.M., I feel light-headed and/or dizzy. My dizziness usually kicks in right after nutrition period, which is at ten, and lasts the whole day. At home, which is the latter of the day, I always feel nauseous. It usually starts at about four, well after I've been home. And around seven, I begin to feel very dehydrated, but I drink plenty of water and juice.I don't understand what my problem is. Ironically, this started around the time after summer ended, which was around the time I started eating again (I was temporarily anorexic, and it isn't the first time). But, it didn't kick in for a while. It didn't happen to me the first time I restarted eating.Anyways, anything would help. I understand my story is all over the place-not exactly organized-but I would really appreciated any consultation on what I should do.Thank you so much, darlings!