Fitness

You haven't described diet at all and that is the most likely issue. You have said you use energy drinks to get through the day which suggests you are experiencing significant sleep debt and also clouding your ability to see true energy issues. I would recommend dropping the caffeine as soon as is reasonable and then see how you feel. Until you can do that I would recommend making sure you are getting enough iron, B vitamins, and calories. It is fairly easy to end up iron deficient and same for B vitamins, but both are readily solved. The calories is actually the hard one, if you have drifted down to low calorie intake it can be hard to pull back up.