draconis is known to be more difficult than abazigal in vanilla ToB, I personally went for sendai first but mostly so i could upgrade angurvadal. aside from jaheira, imoen and anomen who else do you have in your party?
try loading up a sequencer with the highest magical attacks you have and a breach then as soon as he goes into dragon form cast a true seeing and chuck your sequencer at him, then use all of your HLA's and wail on him until he goes down. If that doesn't work try this thread http://www.sorcerers.net/forums/showthread.php?t=21813
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is it the human form or the dragon form that's killing you?
I would definitely go to Sendai first. That is what I did my first time. I felt like a loser but it worked.