While this is kind of a good sign, the effects can be insidious. I suggest taking a break soon (it's up to you whether you want to just stop, of course), and seeing how you feel after one to several weeks. It might be the case that long-term neurological changes are reducing your quality of life, but not noticeably, as you don't have an clear, salient point of reference.
For the most part, no. It's only really in the later stages of alcoholism that you begin to have quite noticeable cellular death linked with cognitive-behavioral deficits (one should pay special attention to the severe deficit in orientation and short-term memory of Korsakoff's syndrome). The brain is remarkably resilient, so it's only really after a large chunk of a lifetime of neurological insults that its plasticity can not cope to allow for recovery.
When physical addiction comes depends so much on dosage, frequency, idiosyncratic factors, etc. An unluckier person on your dosing regimen could indeed easily become physically addicted. The liver is quite resilient, so if you haven't incurred scarring associated with cirrhosis or hepatitic symptoms, you can pretty much recover fully eventually with abstinence. However, you can't really 'erase' the effects of accumulated carcinogenesis over the years. However, both these conditions usually come after decades of abuse.
Good deal. Now is the time to keep it that way.
ebola
