Frequent urination

I've been experiencing episodes of frequent urination that range in severity from going more frequently to constantly feeling the need to urinate without relief after voiding. There is no pain or incontinence associated with these symptoms and I have been ruled out for UTI's. Historically, these symptoms would start several days before my period and disappear once my period began. I recently had a baby and during the pregnancy and for about three months after giving birth, I had no symptoms at all and felt great.

About a month ago the symptoms started to return but my period has not yet started again. There has not been a real pattern this time. I seem to get symptoms for a few days and then they disappear for a few days and then return. I am breastfeeding right now. I have been to a urologist and he put me on Urelle. This helps sometimes but other times doesn't seem to be doing anything. My urologist seems reluctant to put me on anything else because of the breastfeeding. I have played around with hyrdation and water intake. I don't really see any trend with food. Nothing seems to make it better. I am depressed because of the impact this is having on my life and am looking for people who have had similar experiences. After searching the internet, my symptoms seem to match somewhat, but not entirely, several different conditions including OAB and IC. Any thoughts. I am wondering if I need to see a different urologist since this one doesn't seem to have much advice to offer me or any ideas of what might be causing it.