Gained 70 lbs. in 6 mos. Haven't lost a single pound...

I was wondering how worried I should be about my weight fluctuation in the last year or so. I've always been a big girl, last year I had my weight down to 190- that's from 230 months before. I know I still had a ways to go but that was the healthiest I had looked, ever. I was walking outside more and eating almost nothing for awhile. After my last leg surgery I admittedly became depressed. It's always been hard for me to exercise because I cannot do hard cardio like running [I have an AVM- skin ulcer on my left leg that stretches and bleeds,] I live in the northern states so winter put a damper on my walking. But I took a 'gazelle' exercise machine off my parents hands and have been using that b/c of its low impact but tough workout. But the weight really piled on when I developed this self sabotaging nightly binge eat... For 3 or so months I would wait for my hubby to fall asleep and then snack, HARD. I felt my pants getting tight again but didn't stop until a few months ago, when I realized I had gained all the weight plus 40 lbs more. I gained 70 pounds in 6 months. And now that I'm trying to lose weight again, it is not happening. I've cut back, but still I've gain 3 pounds. I eat fruit smoothies, oatmeal, granola, I cook our dinners with low fat and low sodium everything, I've cut soda out entirely, I've made it a priority to drink more water, I walk a mile everyday with my dog- I know all of this because I have 2 different fitness trackers and a workout trainer app. I don't lie to it because that's ridiculously pointless, so I do go over my 1200-1400 calories goal by 200-500 depending on what we had for dinner. And yes I admit, I do still eat chocolate everyday . But I understand what moderation is and have managed to lose weight before with chocolate in my diet. I understand chocolate has to go too, but it seems odd with the extra activity I've been doing and that I quit binging, I have not lost a single pound. It's not muscle either... I have no idea why I went through that binge period, but I'm disgusted and angry with myself. All I had to do was not eat like that and I could be comfortable in my skin and clothing... Should I see my doctor about something being chemically wrong? Am I just not giving it enough time?