1. There isn't a dedicated program, this nerve should be electro stimulated directly (electrodes inside the body) to regenerate (https://www.ncbi.nlm.nih.gov/pubmed/?term=vagus%20nerve%20stimulation) Only one program have vagus in the program, but you should use this and all Nerve programs. You should take all the intestines, nerve programs, and Gastroparesis.
2. If I'm unable to find a particular term, I usually do a general online search to see if there are other search terms I could use within the software to find relevant frequencies. For instance, in the case of the Vagus Nerve:
"The vagus nerve, historically cited as the pneumogastric nerve, is the tenth cranial nerve or CN X, and interfaces with the parasympathetic control of the heart, lungs, and digestive tract. The vagus nerves are normally referred to in the singular. It is the longest nerve of the autonomic nervous system in the human body. The ending part of the vagus nerve is known as the spinal accessory nucleus."
3. I could be remembering incorrectly, but I thought I saw a vagus nerve program in the DH set
For more details, please check the link: