3 weeks to get fit

I've a big ride coming up fast and I'm not in the best of shape. After Christmas I was doing well. I had moved onto doing turbo sessions on consecutive days. Quite hard ones. Previously I has rarely done two consecutive days as I had always given myself recovery or lazy time. Its February 11th now and three weeks to go. I'm sure the fat was disappearing. I don't have too much- but its there. Belly, small man-boobs. Small but perfectly formed.
I was doing well. Even if I would do 5 days then nothing for a few. Something in me just said "No, I'm going to give up and eat chocolate".
Last week I gave up again. For an entire week. And there was nothing I could do about it. I ate cakes, biscuits, sweets- the lot. And there was, I think, no guilt.
I tried once or twice to tell myself that I only had 4 weeks left until my first goal of the year. (and I don't have many). But I was happy not to hear myself.
It's Saturday morning - around 5 am I think - and this week began on Monday. It was the week where I got back on track. Monday was so pathetic it was untrue and worrying. No energy, no interest. I probably did 15 minutes if I take out the time dedicated to faffing and farting about. Tuesday was the same. Wednesday was when it started properly. I drank a bottle of Zip fit energy before and a couple during the hour's session and at least I worked. But I was poor.
Well poor was a bit harsh and subjective. I haven't checked the results but my heart rate seemed high, my breathing poor and my power was, at a guess, 5-10% worse. I did lesson 2 of the CTS course.
Thursday wasn't great but it was better.
Yesterday was better too. The legs are fine from the three consecutive sessions but my breathing isn't as good as it was. I'm please about the legs though. So glad I did that work previously. It has made a difference and I'm sure my heart and lungs will recover. I'll probably lose a bit of this excess fat too but. Not if I still eat junk though. Where has my will power gone?
So, three weeks to go and the question is: can I sustain the training. I see two more weeks of full training then a taper in the last week.
I'm going to try to write this log of my efforts in a hope that it might shame me into action.
The things concerning me, or at the very least need addressing are: will I over-train? I need to get in at least one 70-80 mile ride.

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