You're consuming about 13 units of alcohol each evening (based upon the strength of Smirnoff, as an example, at 37% ABV). The
weekly safe limit, as defined by the NHS, is 14 units. So you're drinking about a week's worth of booze in the space of two hours.
If you feel a compulsion (or, at least, a strong desire) to drink that vodka, you're classed as an 'alcoholic' (or, in more modern parlance, 'alcohol dependent') by many/most medical practitioners.
Alcoholics Anonymous is the obvious support group to turn to
https://www.alcoholics-anonymous.org.uk/
Others are listed here:
https://www.nhs.uk/live-well/alcohol-support/