Thank you everyone who read and responded....appreciate the insights.
I normally play games as the developers intended, but I tried a little trick which (unfortunately, perhaps) works. Kill the Elytra outside Dunroot Burrow, then press the wait button for an hour or two, another appears.....carrying feldew. I did this until I had 7 potions of feldew....not the way to play, eh? Strangely....and I mean strangely,,,,I went into the Burrow and never had any on-screen messages telling me my addiction is worsening (I didn't drink any more feldew from the one that got me through the "gate")....I noticed a -15 to some stats, but not drinking any other potions and not getting the notification of what stage is I was in was a quest breaker, so I killed the addicts in the last stage did not "ingest the cure" and slept for an hour on one of the beds. I don't think it did anything! So I took the cup and my stats were only amended by that which I would have gained sleeping, ie, in the Bravil Mage's Guild. Don't understand it...maybe the script checked that I had 7 felldew (LOL) before entering, and that disabled messaging for some reason. Take care all.

Mark