Up back pain for 16 months i do have large thickening of breast had for long time and mam ok and us ok. temp daily 99.3 or less. ana+1640.would i b sick?

Get medical checkup: You should see your physician to examine your breast carefully. If there is any lump it should be examined with an ultrasound(mammograms can miss 10% of breast cancers) so any palpable lump/thickening requires a biopsy to make sure there is no cancer in your breast. Your ANA level is quite high...It needs to be rechecked; if it is high on rechecking, then consult a rheumatologist to advise further.

Not certain: As we mature one can have a + ANA without lupus. It is called autoimmunity of aging. The back pain is not due to lupus. 99.3 is not a fever. You need to see your physician to define your health status.