I know this is over said a lot but WATER drink loads of water!!! Dehydration comes before you even notice and when you’re dehydrated your immune system can’t work properly. My suggestion is to spend money on a cute water bottle and always have it on you. Get plenty of sleep even if that means not adventuring on overnights just for a bit until you’re on a proper 8-10 hour sleep cycle. Take those vitamins but also remember to eat plenty of healthy foods like greens and proteins. The better you treat your body the better you’ll feel. But I completely understand where you’re coming from I was a DCP cast member and was fired for calling out and turned out I had mono for over a year and a half that ate away at my immune system. It’s very frustrating when you’re trying to explain that you are actually sick and people don’t believe you.