Regarding the internal shaking, mine responded to a dietary supplement from Metagenics called Intesol (antispasmodic GI support). Its main ingredients are chamomile flower extract, peppermint leaf oil, lavender flower oil, and sodium copper chlorophyllin. I am on a regimen being treated with several nutritional supplements in a specified order for hPylori, leaky gut, and yeast, parasites, and bacteria. I was a mess and have made steady progress toward regaining health, weight, and am starting to add a little muscle. I really believe my internal shaking was from the spasms caused by the excess air. I was so full of air caused by the conditions mentioned above. I found GI specialists did not really understand the severity or cause of symptoms. I found it hard to function in daily life. All of this causes or adds to anxiety which only makes all GI symptoms worse. Mine all started with massive antibiotics for about three conditions in a row 2-3 years ago.
Something else I just thought of. The stuck in throat thing I felt when I was full of air. It helped to drink water and force the air down. Also when I took my daily allotment of Gas-X, I found activated charcoal tablets (found over the counter in drug stores or Walmart) to help get rid of gas. But the supplements are helping to get rid of the gas producers.