It could be proteinuria which could indicate a kidney problem. You should see your doctor. It sounds like a pretty good reason to be seen by your doctor. It's your right as a patient to be seen if you feel there is a need. Don't let them intimidate you.
Here is a link for you http://www.mayoclinic.com/health/foamy-urine/AN01702
The sooner the better. You dojn't want 6to tell them what to do, but insist without being the boss, women can do this, that a check of your urine test be made to assess your GFR. The GFR simply is the higher the better. If 50-70 you have no sweat, if lower than 30, start generic testing to see exactly where you are and what is to be done. Get a good Nephrologist. Start right now keeping notes on everything and ask questions and read and learn.
go to kidneyschool.com,
God have mercy on us all
Cicero