Welcome back Linnie. Many of us have returned to drinking after a period of sobriety, me included. The good news is that there's no reason you can't stop now. What was it that you were doing during your last stretch of sobriety? It must have worked well if you have over a year sober. Perhaps we can help you make a new plan or change/improve the old one?
Regarding your last question, you forgive yourself by stopping again. The drinking itself is really the most punishing part of addiction - both for you and those around you. Making a commitment to staying sober is the best amend you can make to yourself.