I have SLE of nephritis, fatigue, severe joint pain butterfly rash, cough, fever, mild swelling, had blood in pee one day could it be kidney damage, flare?

Could be. SLE is a multi-system disease which can effect multiple organ systems. You mentioned that he already had an SLE nephritis. That could cause the hematuria. Have him see his doc soon.

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I have a fever, cough, butterfly rash, migraine, joint pain, and sle should I be worried?

See details. If you have been diagnosed with lupus you are likely flaring and need to call your rheumatologist. If you suspect lupus you need to see a rheumatologist. . Read more...