One piece of advice is to start with the biological side. Getting enough sleep, exercising regularly, and taking care of your physical health can have a surprisingly positive effect on your mental state.
At the same time, don't hesitate to seek help from a therapist. They can help guide the way you think about your experiences and how you interpret them. It's a gradual process, but it really can make a difference.
I believe you can get through this. :)