Being alone at home used to be scary for me. Now I keep busy in the daytime -- like you are -- and at night I indulge myself in little harmless things that I wouldn't if my mate were here -- I wear my rattiest clothes, eat in bed, and watch ridiculous movies on netflix that he would hate. Silly but it gets me through.
It's totally legitimate for you to think of your past wrong-doings and wonder how to make reparations for them. Maybe you could volunteer at a drug abuse hotline, if you've been part of the drug trade. Worried about ripping off Armani? Start leaving big tips to people making minimum wage (or less). Especially delivery guys.
Even if you do something like the above, keep in mind that ruminating over the past *right now* may be a way for your alcoholism to get a toehold while the wife's away. Whatever you think on, think ahead, not behind.