How does one keep a positive attitude?

At least you are aware of your negative thoughts creeping in. Just don't give in. You are much stronger than that and you know it won't help in the long run. I recommend you reading a book called The Seat of the Soul by Gary Zukav. It is very good. I believe that what you put out into the world comes back to you. When you put out negative thoughts those things will happen. When you put out postive thoughts good things will happen. Ask out loud what you want and what you want to change. Write it down and look at it everyday. Live your life with intention, with a purpose. Figure out what your purpose is. Only you can change yourself and make yourself happy. Find out what you have always wanted to do and do it. Good luck. And if you want more info let me know.

I think that you are well on your way to maintaining a positive attitude because you can recognize when negativity starts slipping into your thoughts. Keep a journal and take note of what triggers the negative thoughts/feelings. Meditation or even relaxation techniques can help restore your balance. Sometimes when we are overwhelmed with life and with you recovering from a car accident, I can imagine that stress may be a factor in your situation. Write down affirmations that you like and place them where you can see them. Call a friend that you feel has a positive attitude and arrange to meet them for lunch. Surrounding yourself with positive influences will add support to those moments when you feel yourself slipping into negativity.