Be proactive and set aside some time for yourself to recharge mentally, learn to say no and avoid giving into other's expectations at the cost of your own mental wellness. Make a list of your obligations and learn to let go, exercise or get to the gym 3-5 times a week, it will help reduce stress and ensure you get a good night's sleep.
There is no difference between the both on a molecular level but vitamins cannot be effectively absorbed by the body without food and water. Trying to digest excess of raw vitamins can strain the liver and kidney, causing damage and disorders in the long run. The best way to get your daily dose of vitamins is by consuming a balanced diet.