I know your pain because I understand how you're probably beating yourself up over this. You are human and we humans falter. You can do it, you've done it before which means you can do it again.... seriously
Make a decision to start RIGHT NOW and do it. Don't give yourself time to think about what your missing out on but think about what you're gaining.
It's always harder to get the ball rolling but once things are moving it's much easier to continue in the same direction.
Start with a small goal, that is strict low carb for say, 3 full days, then go from there. You'll find it much easier to stay with it from then because you'll already be in ketosis and your hunger will have diminished significantly.
I'm sorry to go on and on, I just hope you'll find the inner strength to get back on track for yourself.
Know that everyone here supports and understands what you're going through. I believe the majority of us have fallen off the low carb wagon at some stage and have had to battle with ourselves to get back onto the woe that best suits our bodies.
YOU CAN get back to where you were and then even further. Don't think about the big number, think about 2 pounds and then another and another. Before you know it there will only be 2 pounds left.
I think I'll shutup now
All the best