You're afraid because you're conscious. I purposely had a tissue valve put in, knowing I'll need surgery again in ?? years. And I'm entirely unrepentent about it. And the surgery went really well for me. But I do expect to be scared spitless again when the time rolls around. It's just natural to be afraid of it.
The statistics say that a second valve replacement is 25% safer than the first. That may (and should) give you some comfort.
However, we all know that a smaller chance is still a chance. And that's where our heads all go when we're left alone and unguided too long. The only thing I can suggest, other than making the preparations for your homecoming, is to keep yourself busy with other things. Divert your own attention, just as you would do with a cranky toddler. You'll find that we're surprisingly distractable, even as adults. If you can, take a short vacation, or take day trips to places you enjoy. Eat in a restaurant you love.
Waiting is the worst part. That has so often been said here, and I believe it to be true. The good part is that once you get to the hospital, it all just seems to whiz by. One minute, you're being rolled somewhere, the next, you're waking up with a tube in your throat thinking, "I made it! I'm alive! This is so cool! What's this thing in my throat?"
I can't blame you at all for being worried and upset, but try to look at it this way: if your worst fears were to come true, is this how you would have wanted to spend this time?
Dry your tears, Jenny, and untie that knot in your stomach. Your life is largely lemons right now, so you need to add some sugar (we'll help) and make some lemonade. I know you can get through this. You've done it before. In two weeks, you'll be online telling us all that you feel great.
Very best wishes,