I am on Oxbutynin 10 mg ER for overactive bladder for the last three months. Recently the severe constipation has become unbearable and I have had to use laxatives to relieve symptoms. The last few days I have also experienced abdominal pain. I also have begun having bloody noses (two). Can I stop Oxbutynin abruptly until I can speak to my physician or pharmacist? Is it safe?