After making sure you do not have any healthy problems ( diabetes, heart disease, arthritis, anemia, thyroid disease, and sleep apnea)
Here are some things you can do are (most of the research shows to eat protein and carbs directly after your work out) :
Eat some of the following, post work out:
Drink a Protein Shake with Banana - A protein shake made from whey protein, water, and half a banana is a great choice, since your body quickly turns it into energy. I love Shakeology and drink it daily!
Peanut Butter & Banana on Rice Cakes - If you're craving something more substantial after a workout, a healthy peanut butter and banana sandwich will fit the bill. It'll replenish your energy quickly.
Hummus and Pita - Another great carb/protein combo: Hummus and whole wheat pita. Hummus, a dip made from pureed chickpeas (that you can easily make at home, I even make mine with soy beans or black beans, yum yum yum), gives you both carbs and protein. Coupled with the slow-release energy from the whole wheat pita, it makes for a snack that'll keep you fueled for hours.
Yogurt and Fresh Berries - Protein makes sense after a workout, since it contains amino acids that help build muscle. Yogurt can pack around 15 grams of protein; add some dark berries for carbohydrate-driven energy.
Tuna on Whole Wheat - filling and full of protein and carbs (good ones)
Make some Lentils - these are great for energy
On the go, eat some Almonds, they are sweet and packed full of protein and energy
Turkey and Cheese with Apple Slices -If you do not want soo many carbs or are not doing bread, skip it and Spread a soft-cheese wedge over two or three slices of lean deli turkey, then roll up for a quick, high-protein, eat-on-the-go snack. Add a sliced apple for some energy-boosting (and glycogen-replenishing) carbs.
Drinks lots of water before and after your work out
Make sure you get a good nights sleep
Throw in some Yoga - Yoga boost energy levels, as well as gives you a good stretch so it is a win win!
Hope this helps! I will keep researching and do another post if I find some more stuff to do to help you keep your energy levels up after a work out.
Have a very fit day!