I went right back to scratch, running 1 mile X 3 for a week, then 2 miles, 2.5 miles. I built up very slowly and took time out to recover over the summer. Built up to 45 - 50 miles a week before I added any speed work.
I feel a whole lot stronger for doing that and am now running better than I have done for a long while.
I'm having a very easy week this week but will start building back up again from tomorrow. Will start adding back some hill work.
Go with how you feel, don't try to push too hard, there's plenty of time and in the scheme of things, even if it took you 5 weeks, that's not long.