I want you to do this:
When you are not feeling too stressed or sad and not anxious at all, and hopefully feeling pretty good about yourself, I want you to write a letter of encouragement to yourself that goes something like this:

Dear (me, your name, wonderful person….)
You are an amazing, strong survivor.
You might feel bad right now but that is just how you feel right now.  Your emotion does not define the person that you are – the person who is resilient and has been through this pain before.  The person who is going to make it.
This is why you are brilliant………….
This is what you are going to do to be amazing……….
This is why you are special……………
This is what you are thankful for…………

(Add anything else that you would like to say to yourself that is positive and motivational)

You can do this and you will do this!

I know that we live in the digital age but write the letter on a piece of lovely paper (or on a boring piece of paper that has been lovingly decorated or illustrated).
Add a picture of yourself that makes you feel good about yourself.  If that is really pushing it then add a picture of something (or someone) that makes you smile.
Now put it in an envelope (you remember those things that look like the mail icon on your phone) and write a message on the envelope like “open when you are feeling sad” or “a message for an anxious kind of day” and put it in a safe place or stick it into your journal for exactly that kind of day.

Read whenever necessary.
Repeat as often as needed.