Here are a few resources for Painful Bladder Syndrome (PBS) and Interstitial Cystitis (IC) that may help.
Interstitial Cystitis Association (ICA). ICA is a nonprofit charitable organization dedicated solely to interstitial cystitis health issues and care. https://www.ichelp.org
Contursi, J. Herbal Teas for Interstitial Cystitis, Livestrong.com.
Editorial Team, Top10HomeRemedies.com (July 3, 2019), Remedies for Interstitial Cystitis,