I acidently took one 15mg pill of morphine about 3 hours ago. I didn't feel anything at first, but I'm feeling a little dizzy and sick to my stomach now. The morphine expired 2 years ago. I have the medication for my frequent kidney stones. When I had an attack today, I grabbed the first bottle and took it. I didn't even realized I had a prescription that old in my medicine cabinet. Should I be concerned? Thank you for any advice.