Don Winchester, from West Sussex, has told ITV Daybreak that he had to wait eight hours for help after calling NHS 111.
He said: "I kept on being put through to Shropshire, who told me they didn't deal with my area. It was one horrendous day. I never want to experience that again."
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The 10K and half-marathon races take place almost exactly a year after Salman Abedi killed 22 in his attack at an Ariana Grande concert.
Dmitrios Pagourtzis also had several kinds of homemade explosive devices but they were not capable of detonating, county officials said.
After early mist clears, most parts of England and Wales will have another fine, warm day with plenty of sunshine.