We all have bad days, but with a few simple tricks, you can avoid letting that black cloud grow and hover over you, and find your positive energy. 
1. Do not dwell on the negatives
Stuff happens. It's how you respond that matters. If you choose to be victimized by what happens, your negative energy will gain momentum. Instead: 
Stop thinking about it if there's nothing you can do to improve it (if a thought comes up about that situation, do not allow it to continue – force yourself to think about something else). 

Do not talk about it any more than you absolutely have to. Don't give it energy! 
2. Do not speak of your problems, diseases, illnesses or worries 
The more energy you give what is wrong, the more it persists. Yes, we all need to vent once in a while but if you vent, or even when you're just thinking about what's wrong, here are some rules: 

Don't think or say: "I'm so sick, I feel like I've been run over by a truck! I don't know how I'm going to get through the week!" Do think or say: "I caught some bug but I'm taking good care of myself and I'm feeling better every day!" 

Don't think or say: "This job is terrible! My boss is a jerk, and nobody appreciates me!" Do think or say: "I'm looking for a better job and meantime I'm trying to learn as much as I can so I benefit. In fact, my boss is the perfect example of how not to treat employees!" 
3. Let go of the past 
You can't undo anything. It's done. Forgive others, forgive yourself… learn from your mistakes, learn from others' mistakes, remember that NO unkind or thoughtless action ever comes from love but from a place of deep inner pain and release the energetic burden you carry: grudges, resentments, pain, hurt, disappointments, sadness, anger, guilt… let it all go. 
4. Don't give away your power or your happiness 
Remember that when you criticize, judge or blame others, you are choosing to focus on what they're doing wrong or what's wrong with them – and you give these people the power to control your mood and state of mind. Ask yourself why somebody's behavior irritates you so much that you allow yourself to get upset about it. 

Why let others' behavior affect your mood? 
Why give them the power to control your happiness? 
Instead of criticizing, judging or blaming, find something you can compliment them on. 
5. Do not say yes when you mean no 
Honor your needs, priorities, time and energy! You'll resent it. Save your precious time and energy for things that are meaningful to you, or in instances where others ask you to do something, make sure that it brings you satisfaction and joy. Otherwise, politely decline. 
6. Laugh! Smile! 
Surround yourself with upbeat people who make you laugh. 
7. Be grateful 
Appreciate the many blessings, but also appreciate the struggles and frustrations. How have you become enriched because of them? 
8. Don't worry 
Use your imagination to visualize what can go right, instead of what can go wrong. Train yourself to visualize the best-case scenario. Be solution-oriented, not problem-oriented. Think only about the ideal situation, not the current problematic situation. 
9. Run it off 
Exercise physically removes you from your problems, and it also removes you mentally. If you're worried about something, you need to give your brain a chance to process things. 

Exercise will flood your system with feel-good endorphins, release stress and in the middle of a long bike ride, walk or swim… or in the middle of the climbing wall, you may suddenly have an epiphany. Or, at least for a while, you will be fully present and not worried about the future. 
You have the power to control your mood. Use these positive-energy-boosting exercises every single day. 

Before long, you will be the high-vibrating ray of sunshine that brightens everyone's mood!