I love what @jonig said. I found that I tend to give good advice and I began to question why I would go to other people when times got rough or complain about it to others. I started writing things down in a journal, just thoughts and things, and I would be completely open and honest, no restraints.
Another thing I do is make sure I've come to terms with my past. I used to have a massive amount of memories that would haunt me that would come back and I couldn't get rid of, and I learned that I had to face those memories, most of the time where I didn't forgive myself for something, and I would tell myself to "let go" of the emotion and guilt and hate, and replay it until I wasn't uncomfortable "watching" it anymore. I do that naturally, anytime I have a haunting thought or anything that is extremely uncomfortable. It has to be organic, and understand why that thought came to you in the first place as well. This is a little off topic but it could help your overall peace of mind.
The last thing I can think of is taking time in nature alone. Go to a garden or the beach or somewhere and get away from everything. One problem I have is mirroring, and I think most of us Empaths have this as well. It's where you show what others want to see, for the sake of harmony in any given situation. That and other people's energy and emotions will overload you. I know times where I'll be with people and I'll start saying things or something to go along with the conversation, but then I'd question myself about it or why I was talking so much or anything, it wasn't even true to who I was. I highly recommend getting away to nature and getting close to nature, really feel it and the emotions it gives you. I've found that through really grounding myself in experiencing a moment in nature and focusing on what it feels like to me and how I feel inside from it, I in turn get closer to myself. It's helped me to stay positive and be in an overall better state of mind.
I don't want to sound preachy or sound like I'm attacking or anything, but I have genuinely found that when I want to complain about something, it helps me tremendously to list of things I'm grateful for in the moment instead. It keeps me in a better mood, a better place, and I almost feel like I "shine" because people notice when you get to that place. You'll walk in a room and people look at you differently in a very good way, its a contagious smile and it just feels great.