It's very important that you get examined by your doctor. Your health issues need to be checked out. Make sure to tell your parents.
You might want to get vitamins and minerals tested.
You could be low in Ferritin (iron storage). You can have normal hemoglobin but low ferritin.
Checking Vitamin D and Vitamin B12 is a good idea.
My daughter felt sick in the shower. Dizzy, chest felt weird. She was dehydrated. Sometimes I'll make her drink a glass of water with a pinch of Celtic Salt or Pink Himalayan Salt. They both have some minerals in them. You can add a squeeze of lemon in it too.
Make sure you're drinking enough water. You need to keep your electrolytes balances. That's your sodium, magnesium, potassium.
try rhis primera juice. Im sure it ill help you..