What Increases Kidney Pain While Standing?

Had UTI For 1 Week.Also Had Kidney Pain In Both Kidneys The 3rd Day. And In Only 1 or The Other For Next 4 Days. After 8 Days In Bed... Lots of Cranberry Juice AND CranB Pills.UTI Symptoms Went Away.Day 10 Was On Feet Most of Day.By Nite Pain In 1 Kidney Returned.3 Days Off My Feet... Felt Fine Again.Standing Again Yesterday... Kidney Pain Again Today.Why Does Standing Make My Kidney Pain Come Back?