Firstly congratulations Joozys on twins - what a shock. I think it's perfectly normal for you to feel overwhelmed at the thought of having double trouble. Do you have good family/social supports to help you?
Twins is such a blessing and I do believe that you will find away to get through the trying times. I always think that in our thoughts things seem harder than the reality and we are a lot stronger than we give ourselves credit for.
But yeah I think it's normal to feel scared and want to have a vent about your concerns so don't feel selfish or bad.