Drink Driving Offence & Increased Liver Enzymes

Last month my GMT was 51 and last week my GMT was 38.
I have only drank on 3 occasions since April (all in July) and have been on doxycycline for the past 11months.
I understand doxycyline can increase GMT and the second reading was when i finished my prescription so it is getting better.
I will get my disqualification again if i fail the DVLA test but nobody seems to be able to advise me on how to pass it!
What level does my GMT need to be to pass the DVLA medical?
How much longer will it take to reduce my GMT to this level?
I cannot find any info about this on DVLA website and i am starting to worry that it wont get any lower.
Thanks for any advice you can give me!