I wish I could pinpoint the cause for you - it could be from a viral infection - some viruses cause hives.
It could be an auto-immune disorder.
I do not think it is liver related. It could be that just like the HUMAWORM pulled out the virus that caused the cold sores - it is now pulling out the virus that might be causing the hives.
If it is viral related, then you have a good chance of treating it - if it is auto-immune related, then it will not be so easy to treat.
What you are doing is all you can do right now. I wish I could do something more for you to make it better.