I do NOT understand his reluctance to prescribe Metformin. Docs do it ALL the time for people with your blood sugars, LONG before they are "official".

Maybe you could/should discuss it with your PCP or even your pulmonologist. I doubt your pulmonologist would prescribe since it is outside his specialty, but PCP's would not have a problem prescribing it. MANY PCP's actually treat diabetics rather than send them to an endocrinologist. Diabetes is well within the scope of a PCP when not contraindicated.

I am not familiar with the drug prescribed but I will look it up.

I realize you are NOT diabetic but I am also darn sure your blood sugars need attention. They are NOT normal. I am not saying you are pre-diabetic, you have something going on that is causing your spikes. Someone needs to find the cause of your spikes. I would keep seeking answers. Do not accept that you do not fall withing the guidelines of the ADA. I know and have heard THAT response. As long as my A1C stays below 7.0 (the ADA guideline for diabetics) my doc is satisfied. I am NOT. When I get post-prandials in the 300's, I am NOT satisfied because it takes dropping into the 50's to get my AlC's below 7.0 Only after explaining to him that I did not want to go blind, lose limbs, have renal failure, etc. because that was OK with the ADA, did I get a different response. I said that the ADA was not the one that was going to suffer the consequences of my spikes and I needed something to deal with them. He then took my swings under consideration and has worked with me to help control them.

OK, I need to retract some of my prior comment. I looked up the drug prescribed which is a DPP-4, one of the newer classes of drugs for diabetes. I also looked up Metformin which is considered first line treatment after diet, BUT, and here is the clincher that would explain your endo....... Metformin has lung disease listed as a contraindication. Ah, that is why I am not a doctor, just an ignorant patient.

When will you see your PCP again?