Well, the rule of thumb for alcohol is, if you wonder if you have a problem, you probably do. (That's rule of thumb, not infallible prophecy.) But "having a problem" is not the same as "puking, stinking, staggering drunk every day". You're probably not overboozed, you're overstressed. But that situation has a way of reversing itself very quickly.
When you're craving (something to relieve the incredible stress which just happens to be alcohol at the moment) as much as you indicate, your stress level is probably dangerously high. Alcohol is a great toy, but a poor medication.
You should probably stop drinking martinis for several weeks and maybe get the gin out of the house. And no fair replacing it with something else that's mainly for a fast buzz. Drinking for a fast buzz = sirens in the distance. If you can handle just a couple beers, fine. Drinking two beers a night for three weeks and still craving booze like mad = sirens right outside your door. Don't allow yourself to fantasize about booze while you're not drinking, and don't allow yourself to be bitter about not fantasizing.
When you have reduced the booze temptation, maybe focus less on the alcohol and more on the stress. Someone who knows you and your situation well would be able to help you with a specific strategy, since there are innumerable stress-reducing strategies. Exercise, prayer, artsy-craftsy-creative stuff, puzzles (of all kinds), and talking earnestly with friends and family about your situation might be good places to start. Maybe you even need a different job. Not every person is suited for every job, and some jobs aren't suitable for anybody.
We are all bound by habits, so getting used to drinking as you do isn't a huge deal yet. You are wise to be looking into it before it's a big problem. There are a lot of people who drink as much as you do, or far more, and never have any trouble with it...and a lot who would quickly become alcoholics drinking like you do. It's more the state of mind than the amount you drink.
G'luck
