Since you already seem to know Nicotine is your problem, I am not even going ot get into Changes in Vaping......at this point.
Obviously you have some serious medical concerns and Medications you Must take to Help with those matters.
Your First questions to your Dr. should be about adding Nicotine to your Medicine regiment and how it may effect your treatments.
No, just for giggles.................... Have you tried, or would you try, the patch?
A good way to see if all Non-smoking methods of Nicotine intake are effecting you or only Oral intake.
You can still use your Vape gear for the hand to mouth and lung pressure habit/desires.
As you may have noted, there is an ongoing battle over the effects of Vaping on dehydration. As one who has been Hospitalized from Dehydration and have always pushed the edge - (High energy output, low body weight), I do not prescribe to Dry Mouth/Throat as heavy dehydration.
I Do Believe Nicotine, entering the Abdominal area, can have strong adverse effects on someone suffering Gerd. My Dr says Acid Reflux, and has me on what amounts to Prilosec - for life.(Had 2 Esophageal surgeries)
However, I do not suffer your other conditions. Not to the degree of medicinal treatment anyway. Therefor I am able to handle 3mg/ml nic.
Think outside the Box