Getting back into training

[westbeast]

I'm just under five weeks out from my third HM and I haven't run in two weeks!  I've been really sick with the flu and have absolutely no energy to get out there.  I tried a 3.5 mile last week and it had me exhausted the rest of the day and I think might have set me back from my recovery.  I've given up on PRing but would still like to finish the race in a decent time.  

I'm itching to get out there asap but not sure how to do my miles.  I was thinking of keeping them low (3-4) and then long runs at 7,8,9,10.  Any suggestions or tips?  Thanks ladies!