Help with interstitial cystitis

Hi - I have tried many things with gynourologist and all have proved unsuccessful.
Just talked virtually yesterday and Dr and I agreed I’ll just be in touch as needed, since I don’t want to waste anyone’s time and spend money
Am thinking of trying a supplement L-Arginine.
Also I know I should get rid of coffee but having tough time- take amitriptyline at night to help me sleep with bladder issues, so often groggy in morning etc.
She had said something about maybe trying espresso/ latte with milk as bladder likes milk but
I guess that doesn't make sense as usually isn’t that stronger coffee?

Thanks much