How to ask for breakthrough pain meds

I’ve been on my current meds for several years. However I find it doesn’t last the entire time (6 hours) and for the first time I’m running out of meds. Mostly this is from waking at night with pain. I tried morphine ER at night and it didn’t help. I’m not trying to get high, I’m trying to live life with some amount of normality. Yet I’m so ( afraid, ashamed, embarrassed?) to ask, especially since my previous provider just left the practice. Any ideas about this? Why can’t we try other meds at night?