First thing... going from couch to 10K, with your physique, is an impressive feat in 7 weeks. Well done!
Second thing... I doubt that your body is really ready to do much more at the moment... your heart and lungs have obviously adapted to some degree, but your legs have been taking a lot of repetitive high stresses... and it takes a lot more time for your bones and tendons to adapt. With the amount of progress you've made, they've probably been accumulating microdamage faster than it's been repairing itself. So having a little dip in your training for a week or so is actually a very good thing.
After that, assuming you're running 3 days a week, I'd have a month where you do a Sunday 10K on your own... at a slow place... perhaps starting out around 70+ minutes... but speeding up by 1.5 to 2 mins per week.
On the other days, a 3 mile slow run and another day where you do a 4 mile run where you run at a steady pace but throw in a "fast mile" somewhere in the middle. Maybe extend the length of your "fast mile" by a quarter of a mile each week (so your 5th run would be 5 miles with 2 fast miles). Not that 'fast' might be 10 min per mile pace. Maybe have a swim or a bike ride on one of the other days.
Once you've got that next 4 or 5 weeks out of the way, have another recovery week and reassess where you're up to. Good luck.
One knows more than 99.99% about this game, with this knowledge.
Not sure where this obsession with fueling has come from, its almost irrelevant.
Historically, running (racing) a marathon meant that under the rules you weren't allowed food or, in the case of fluid, no drinks for the first ten miles. The training to learn to burn fat has evolved from that. Now days, there's no need to train for that.
What you do have to do, is train to run for several hours in one go. One over distance run once every six weeks will be more beneficially than a load of miles made up of short runs.