Running

I am going to be doing my first half marathon this Sunday.If I do well in it I planned on doing the thanksgiving day marathon in November.
But my plans are not my legs plans!
Let me start at the beginning.I was training wisely,regular runs with periods of rest and had gotten to the point where I was running 33-35 miles a week comfortably.
Then my husband was diagnosed with diabetes and he started exercising regularly and we walked 3 miles every day.With all this added on my leg said"ENOUGH".So 2 weeks before a half marathon I had to take a weeks rest.I went for a short walk today and felt great.
To do or not to do is now a problem !I know I can do 13.1 miles but will I end up hurting my leg?
Not to mention that if I have to give up running,I will shrivel up and die or I will bloat up and burst,to be precise!