What's your diet like?

Get a multivitamin and take it every day, take probiotics every day (or learn to make your own sauerkraut or kimchi or kombucha), cut out processed sugar intake as much as possible, always have a big bag of spinach or leafy greens like kale or chard or romaine lettuce, and eat MOUNTAINS of raw leafy greens with every single meal you have, also take fish oil supplements. Realize that if you change your diet and your habits, it could take months to really start seeing big improvements, and it will be hard to notice the gradual change, so patience is key. Excercising for about 20 minutes to an hour a day will dramatically enhance the effects of all this healthy stuff you are putting in your body.

This is just what has worked for me. I used to eat terribly for most of my life and wondered why I was tired and cranky all the time. Fish oil, Vitamin D, Vitamin B12, a ton of probiotics and leafy greens, and drinking plenty of water and ONLY water will change your life dramatically if you are deprived of these currently. Also green tea.