I can totally relate to loosing and regainnig and trying to start again. I'm 50 years old (will be 51 in Oct.) and have been trying to loose on and off for years starting with only 5 lbs when I was 16 and all that dieting got me up to 250ish -- in my 40's my life turned to choas (once again) and I gained a ton (over 290 lbs at one point).
A couple of years ago I lost a little over 100 lbs and reached a plataeu I couldn't budge (stayed between 175-180 lbs) -- so I went off the for a little while and that little while got longer and within a few months I had gained all the weight back and more (which I had done many times before, just never that much).
So in May of this year at 284.5 lbs I started all over again (goal 140 lbs.) It wasn't easy - I'm down to 258 this week. I just try to take each day one at time. I also have to watch my sodium now (doctor's orders because of high blood pressure) - so a lot of my favorite diet foods are off limits.
What helped me get started was focusing on my health -- I wanted to feel better, to be able to climb a flight of steps without needing a nap. I searched and searched until I found foods that were filling and comforting and healthy for me that I could still have on my diet for those times when emotional needs just had to be tended too at least a little with food (to avoid binging) -- like low fat chocolate pudding, baked potato with 0 calorie butter spray.
Having food in the house that easy and convenient helps. I am exhausted a lot of the time and unless the healthy food is right there that I need when I'm hungry, I'll have a hard not reaching for something fattening. So now I make sure I have fresh fruit, some frozen dinners I've prepared myself on hand, and bags of frozen veggies. A whole bag of veggies is only 130 calories and once I eat it, I'm full and usually resist any temptations.
Take it slow, make small changes are you are ready to.