Re: Elevated AST
Good news, and not so bad news... The AST elevation is a mild one indeed as liver enzymes often go well into the hundreds when your liver is truly unhappy. No hepatitis or excess alcohol, and getting off any prescription meds you don't really need is good too.
Not so bad that you need to keep tabs on this until you find out what's going on. Hypoglycemia and "insulin resistance" often go hand in hand, but usually can be fixed without too much trouble. Avoiding large sugar spikes, like those caused by large (big gulp) soda's or big sugary breakfast's or desserts may be all it takes.
Dietitians will tell you: "Breakfast should be a feast, lunch a meal, and dinner a smaller affair", and this is good advise too.
I would hope a biopsy wouldn't be required at this point unless there is something irregular in the scan (which should be done first), but the scan is a good idea.
Best not to sweat the small stuff at this point... Your GI doc should be able to sort things out, so wait until you see him and get scanned before you read too much into this.
Worry can make you sick too!
Good Luck and GodSpeed to you.