A week off won't do much to fix shin splint/compartment syndrome issues, personally it was more like a month and then it hadn't gone, it just became sort niggly and manageable, but still hurt for days after anything pacey and the first few weeks back there was plenty of denial and telling myself it was all OK - so tempting to do too much again.
My problems stopped when I rested for around 3-4 weeks, had physio, did daily strengthening exercises several times a day with bouts of icing (horrible). When I started back I had to cut down the weekly mileage as I'd been doing too much too soon - shin splints are often a result of overdoing it. I just did a parkrun a week and a lot of dog walking and cycling. A compression sleeve helped, or maybe it was in my head. Stopped wearing shoes with a large heel-to-toe drop and stopped heel-striking. Wearing a more minimal, flat shoe I soon got the feel for a bit of better form - when every foot that lands hurts you kind of do naturally, especially downhill.
You ran 3 miles + a day for the best part of a month, that's a lot of running without recovery if you weren't already running 30+ mile a weeks before, no matter the pace. I wouldn't fancy doing it now, not a chance! I ran nearly 200 miles in December, but there was a lot of rest and walking in between.
EDIT: Sorry, Festwill, I'll be more careful next time and avoid taking your rightful spot at the top of the page /o\