Blood presssure has nothing to do with malignancy.the swellings are very small, <1cms which are not significant. your low back may need pain killers. you also have no other systemic symptoms suggestive of lymphoma
. keep a followup of these lymphnodes
and see for the increasing size.if increases in size these nodes biopsy
should be done. you need to undergo routine urine examination to see for abnormal cells or microorganism followed by urine culture to rule out infection.