Getting outside can be pretty difficult sometimes.
Try---------
Talking to yourself and reasure yourself that it is safe.
Phone a friend before you go.
Go out with a friend
Hold an object to keep yourself grounded
Concentrate on each step that you take and really feel the ground
Exagerated role therapy---- Pretend that you are superman or superwoman (sounds silly but does work,especially when shopping!)

These are just some ideas that I use but don`t be to hard on yourself, it takes time.