I am sorry to hear that you relapsed, but "it takes what it takes". I wouldn't go to Portland....it sounds like a set up to me. Why don't you make last night the last hurrah?
For insomnia I pop a couple of Benadryl. It knocks me out, and I actually sleep soundly. When I used to drink and pass out I would wake up tired, because it is not really restful sleep.
C'mon.....do yourself a favor and quit while you are ahead.