You can't do it all by yourself. Seek support from people that you trust.
If you search, you might find what you're looking for. Don't wait for it to find you - you must be proactive. The answers will not fall in your lap from the heavens. Go out there and find what you need. It's waiting to be discovered.
Long days at work aren't just physically draining, they can be emotionally draining as well. It's important to maintain your physical health, but it's also important to build your psychological stamina.