What do you do, who do you turn to?

Having had a weigh in and lost no weight I started a downward spiral. I've drunk a lot of wine, I've not slept, I'm thinking if cutting myself and I don't know who to turn to. I came down if the initial high of seeing dd and all the gym stuff but I seem to have plummeted big time. I don't know who to talk to, who to see, who to confide in or who to attempt to tell how I'm feeling. I don't think I even know how I'm feeling myself right now. The urge to cut is so strong yet I know it's so wrong and would be taking a step back but the difference in my mood between a fortnight ago and now has scared me more than anything. I was doing so well I was prepared to come off the venlafaxine but now I just don't know. The sheer high from dd almost seems like mania compared to how I feel now. In 2 hours time I'm meant to be doing a fast walk but I don't know how as I've do many prescription drugs flowing through me! I'm feeling really desperate.