My heart goes out to you. This has all hit you with such rapidness that there was really no time to even get your bearings before the next thing to try and deal with came along.
Sweetie, take a look back. You have handled it all and done it admirably. I don't think you really stuck your head in the sand, you just went on automatic pilot and did what had to be done. I believe it a self protection thing.
Now that everything is done, it's hitting you full force because now all the decisions to be made from now on are yours. It is scary but there is something about not having to answer to anyone for your choices that is quite freeing. Believe me, I know it's not what you wanted.
Hang in there Irish. The fear will start to fade as you start to believe what we all know. You're a very smart, capable, strong woman that will be better than OK.