I know this post was from 3 years ago, but I'm still reading, and thought someone else may be too.
I have GAD as well, though it's associated with PTSD. I have had REALLY similar symptoms to those described above, and yes they can be anxiety-related. No, they are not in your head, not at all.
HOWEVER, looking at this list exactly as it is literally SCREAMS gall bladder to me. The limp in the throat and random tingling can be anxiety, but when it's specifically in the face and lips along with numbness, that's a really specific symptom that will help with diagnosis.
Please just keep in mind that the nausea, dizzyness/vertigo, pain in the rib cage, blurred vision, abdominal pain, and belching -- especially all together like this -- would be classic gall bladder and/or liver issue.
I hope you found some help!
I have GAD and panic disorder and I have all your symptoms minus the stomach pain, and the electrical shocks.
I get brain zaps in my head though but thats from xanax/prozac.
So anxiety COULD cause all your symptoms for sure, the brain is a very powerful thing. Just make sure to rule anything more serious out.