Yes, You do need some evaluation. Urine infection could cause the problems that you are facing, and you should get at least a complete urine analysis done. If it shows pus cells, you might have to get a urine culture and sensitivity test too.
Sometimes, a neurogenic component could be added to the bladder dysfunction
. If there is absence of infection, you might need a urodynamic test to assess how is the bladder muscle - is it overacting, and is the pressure too high, and how are the sphincters - are they too tight, and not coordinated in which case the bladder pressures might be too high and can cause kidney dysfunction
. Please do not get a urodynamic evaluation in the presence of infection, though - it could get worse.
Hope I have been able to help you.