Everyone will tell you different ways to cope with the depression and anxiety caused by PTSD.  Each are valid methods and each will have different effects on different people.  It is worth giving them each a go to see what works for you. 

Some notably effective things you could try to fight anxiety and depression are:

Get as much sleep as you can.

The brain gauges the amount of light you get each day, and it uses that information to reset your body clock. Without light exposure, the body clock eventually gets out of sync, and when that happens, it throws off important circadian rhythms that regulate energy, sleep, appetite, and hormone levels. The disruption of these important biological rhythms can, in turn, trigger clinical depression.

Practice mindfulness and meditation.

Mindfulness meditation is a mental training practice that involves focusing your mind on your experiences (like your own emotions, thoughts, and sensations) in the present moment. Read more... 

Exercise and eat well.

Regular exercise can have a positive impact on your mental health by reducing the anxiety and depression caused by PTSD. Read more...

Be social and have personal contact.

PTSD can make you feel disconnected from others. You may be tempted to withdraw from social activities and your loved ones. But it’s important to stay connected to life and the people who care about you. You don’t have to talk about the trauma if you don’t want to, but the caring support and companionship of others is vital to your recovery. Read more...

Use aromatherapy to help calm and relax.

The positive effect essential oils can have on us is astounding, and people with post traumatic stress disorder often find that aromatherapy can help them to manage their symptoms. Read more...