Sorry I didnt see your post.Could you explain what an oab is?Also,I'm not sure if it is painkillers that are causing me to pee so litle or the peridium.Dawn informed me that peridium is not available in the uk so I'll fill you in if you arent aware of this drug.It's for bladder pain and urgency specifically for the bladder.It turns your pee bright orange.I dont find it at all helpful for pain but it helps urgency a lot.I use a drug called toredol for pain.It's really helpful.However, i guess there could be a connection to the painkiller part of it.I do take toredol often for pelvic pain specifically premenstrually and never had the barely ever peeing thing.You should probably check this out with your doctor its interesting though isnt it?All the different things that go on.It's no wonder doctors cant figure half of it out when we are all so unique.I dont think its all in your head though.I believe that we know our bodies best.this doesn't mean that I'm saying dont listen to medical advice:Just that we shouldnt minimize our own experiences just because the doctors arent aware of something we already know.Just look at how many people persevered because they knew something wasnt right and finally got a diagnosis that another doctor said didnt exist.You are the expert of how you feel.Hope you figure this out.Good luck.Jenny