If you are still really convalescent then I'd suggest making it a gentle hill walk. No point 'pushing' if it just rolls you right back to the bottom.
Bravo on W1 round 2... I have had a month off before now but way too scared to go back to W1, I just tootle out and do a slow 20 minutes, 30 if if feels really good.
As CatMo13 says, you could try a Week 2, run and then a Week 3 run etc. until you find your level. I would be surprised if you could not manage a Week 3 run, but it all depends how much your illness has taken out of you.
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