(((((((((onmyway))))))))))))))))

I can so relate to googling health conditions and getting myself into a terrible panic. I do this a lot too. I'm really sorry you've had this scare
I'm wondering what they said to you at the hospital when they gave you your ALT results?? I'm thinking if they were concerned about heart failure - or anything - they would have kept you in??? Who gave you the results? Was it your doctor? If not, can you call your doctor to discuss your concerns??? I would do this right away if possible. And hopefully he/she can put your mind at rest. Also, did you increase the Epival already? Perhaps that is responsible for the spike in your ALT levels?? Again, I would definitely call my doc about this.
It sounds like you have a doctor's appointment tomorrow, but perhaps you can talk to the doc on the phone today first?? I would try and push for that.
Re the blood pressure, I have worried about the exact same thing. My blood pressure is on the low side, and so is my heart rate. Even when I'm having a panic attack, my blood pressure stays pretty low and my heart rate doesn't go up into anything like the ranges that some people talk about. Yet I feel like I'm about to die! I have also worried that I'm about to die because my heart is not beating fast enough. That's one reason why I don't take sedatives. Because they slow your heart rate, and my heart rate is already on the slow side. It makes no sense to me since everything you read about anxiety and panic attacks talks about increased blood pressure and increased heart rate. So I can definitely relate to your fears here. However, I've had my heart checked out and I've been told it's working fine. And yours might well be too. It's definitely good good you're getting your heart checked out tomorrow, to be on the safe side.
I really feel for you and I hope you can talk to your doctor very soon. Let us know!!