We are not allowed to give medical advice on these forums. If you think you might have severe withdrawals when quitting, you schedule an appointment with a doctor. They may refer you to a specialist (not sure how it works in the UK). In my case, they prescribed librium on a 7 day taper, thiamine because alcoholics are usually deficient in this vitamin, and then naltrexone for cravings after. I eventually went off naltrexone because it is not allowed in my line of work.