Wow, I can't believe so many people are living with this pain for so long. I started having pain in my abdomen 4 days ago at night. I wake up a couple of hours after going to sleep in severe pain. Last year I had bladder surgery for cancer and after that I had mild pain at night until I emptied my bladder. Now it's severe and peeing only helps a little. I found that taking 1000 mg of Tylenol extra strength before bedtime and no pain at night. Don't know how long I can keep taking it though. I am a male 54 years old. I've talked to my urologist about this and he has no idea what's causing it