Most people drink socially. If you are drinking alone you have a serious problem and CAMH is likely your answer.
Well, there is drinking alone and "drinking alone". Alcohol is always something I've kept an eye on given a strong family history of problem drinking on both sides. I neither drink alone or "drink alone", but plenty of people can handle a couple beer or glasses of wine on the regular while alone. The same goes with smoking a little pot. Other people can't. Frankly, I count myself as 'other people', which is not to say I don't imbibe, or over imbibe, but I'm careful with the what, why, and how often.
Though most of the rest of your advice is solid, IMHO. Basically, if you need to reduce or eliminate drinking, you need to fill that time with something, and that something shouldn't be, "trying to avoid drinking." That's literally setting yourself up for failure. Mind you if a person is a long time heavy drinker they should taper off their consumption, or seek institutionalization (short term inpatient rehab), because just quitting drinking can be really dangerous. See:
http://www.webmd.com/mental-health/addiction/alcohol-withdrawal-symptoms-treatments#1
A lot of people dislike AA for being cultish, Christey, and for making people's addictions the centre of their lives on an ongoing basis, but I've seen it help people first hand. Especially when it comes to that initial period when people really struggle to figure out the basics of even trying to live sober (and are faced with trying to pick up the pieces of their lives). For many people AA is going to be about as good as it gets for ongoing support and treatment, so even if you don't fully buy in, a person could do worse than to look at it as a set of tools that you can pick and choose from to help you transition to sobriety.
Anyway, good luck to the op, try to do it on you own, and get 'real help' sooner rather than later if you need it.