JK.....this will be our biggest challenge of the week.....dealing with 'off day' eating. Again, you're not cutting, you're not trying to maintain a weight, you're not the average Joe trying to drop a few pounds for your class reunion, lol.....you're trying to build slabs of muscle, and you're training hard, and to top it off, you're building yourself back from a weakened state and need the food.......calories are calories are calories....all low carb does, all cutting off carbs after a certain time does, all any complicated dieting trick does, is restrict calories somehow, you don't need calorie restriction.....stick to your plan, think of it as both repairing from yesterday and fueling up for tomorrow.......cuting back cals on an off day when bulking is as foolish as a trip to Cold Stone or a SUpersized order of fries on an off day when cutting.
As far as your concern about having done irreversible damage, don't worry about it.....you'll be fine. It is all in your head, understandably so, but still, it is worries and anxiety.....you added 10lbs to your SLDL this week, so you're capble of making progress, add 10 more next week, and 10 more the next, and you'll be back where you were in college in due time.....it's just simple progression, the state you are in took 4 years of abuse to get to.....it won't take 4 years to correct, but it is gonna take more than a few weeks though....just be patient and see it through.