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See above. You need a comma. Also, without surrounding context I can't see why you used the past perfect. The natural standalone sentence would be "Ten months after I fell ill, my friend paid me a visit."
See above. You need a comma. Also, without surrounding context I can't see why you used the past perfect. The natural standalone sentence would be "Ten months after I fell ill, my friend paid me a visit."
It's OK though the comma isn't necessary. The sentence flows better without it as a simple statement of fact. The comma suggests a slight pause on the part of the speaker.