Good thing you mentioned the liver, I know exactly what this is because the same thing happened to me and it has absolutely nothing to do with anxiety. You have low blood sugar. An inflamed liver is one of the first serious signs of it, along with panic attacks and is in fact the first thing my doctor found wrong with me after test after test after test. Everything else you mention ties in with it, the family history, alcoholism, it's really a classic case and you're lucky you posted everything up there the way you did because I'm 100% sure this is what you have. Normally the person is fine all their life and then one day bam they wake up in a state of panic for no reason or it suddenly comes on in the night or during the day but seems to have little if any connection to anything stress related. You need to get a glucose tolerance test to be certain, but the way to do it is thus. Go to your doctor and tell them you seem to feel different depending on what you eat, don't mention hypoglycemia at all. If they suggest the glucose tolerance test, take it, if they don't and say not to worry about it,
find another doctor immediately. Trust me on this and don't mess around, if you don't fix this you'll just keep getting worse. Anti-anxiety medication can help, but all it will do is mask the symptoms, not correct the root problem. If you let it go and just take the medicine to eliminate the symptoms, other symptoms will sink in, perhaps delusions, fainting, twitching, blurred vision and so forth. It's a very, very serious condition. If you have any questions PM me, it is treated through diet and a drug called diazoxide. Or just one or the other.