Oh, Amanda, honey...you are in my heart and my prayers; you just gotta know it. I'm praying that God will surround you with His peace--that peace that we can't really even understand but can come to us just the same and comfort us in amazing ways. God will help you through the darkness and the fear and will not give you more than you can handle.
Amanda, I don't mean to sound like an old lady, but when I was about your age (you know, back in the day

), my father was sick, too, and his health was, like you said, "worrisome." I was about 27, I think, when he had open heart surgery. Everyone's situation is different--mine was not quite what you're experiencing, certainly--but I remember how afraid I felt at the time. Your heart is heavy, I know. Imagine yourself getting a big hug from me.
Amanda, have you talked to Beth about any of this? She's an amazing source of medical knowledge (you know you are,

Beth) and might be able to give you some insight into what to expect with the tests and all. Keeping yourself as informed as possible can help you feel less vulnerable, I think.
Knowledge is power, you know.
So, girlfriend, know you're not walking this part of your life alone. Take it one day at a time and try not to let your mind run away with you. Enjoy yourself tonight and draw strength and positive feelings from those around you. Also, Amanda, remember that taking care of yourself, emotionally and physically, is what your dad will want you to be doing. Give yourself a dose of TLC along the way.
With much love, Amanda,
Erin