I have PTSD.

I'm new to all of this. So i want to start off by saying hey to everyone :)
i didn't know i had PTSD until recently. Well, i think i knew..i just didn't want to admit it to myself. I didn't know that it had gotten that bad..until i would remain in my house all of the time. secluded, in one room. on the computer as my escape for the day.
It gets so bad, that i wont sleep. I'll run off of less then an hour. It's horrible.
I'm seeing a doctor quite soon about all of what has happened to me..to cause this.
I'm so nervous about it. I don't want to have a panic attack in the doctors office! scenarios are frequently running through my mind..about what could happen during this appointment. ohhh boy. i just want to get better. and live my life again. :(