two things to congratulate you on - Booking in for a check up with the doctor, have blood tests on as many things you can. Second is your start in giving up the energy drinks, well done.
Tips for energy, Vitamin B,
Have a banana, this is packed full of energy, many athletes have one prior to exercising
Protein, make sure you have lots of protein, Peanut Butter on toast, Nuts. Most people need between 40-70 grams each day depending on your gender, age and situation. Calculate your protein needs by Weight in pounds divided by 2.2 = weight in kg - Weight in kg x 0.8-1.8 gm/kg = protein gm.
Iron, low iron levels (get yours checked) lead to anemia
You are probably experiencing withdrawal of your energy drinks so just be patient.