Turning 50 in July

Okay, in August of 2010 I joined MFP and lost 40lbs. Which was so great! I felt wonderful and was well on my way. Then stuff happened and I just slid right back where I started, gained almost every ounce back. I'm turning 50 in July and I want to participate in life and not hide from it anymore. I am seriously ticked off at myself right now because I have no excuse for this. There were reasons that contributed to my original weight gain that started after two kids in my 30's and just grew from there. I still can't fathom how I let myself gain twice what I used to weigh, then started to lose the weight and THEN gained it back again. But though there were contributing factors there's still no excuse for it because I was healthy and I should have worked through the problems/stress/emotions instead of eating my way through it. So here I am again, starting over. My plan is to lose as close to 70 lbs by my birthday as I can and just keep going from there!