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Hi, I am an American Board Certified Neurologist and I am very glad to help you with your health concerns.
Yes urinary difficulties can occur after taking opioid drugs like morphine. While constipation is more often associated with morphine but some people experience difficulty in passing urine too. Some experience both problems (difficulty in passing urine and bowels both, some only one of these problems).
In your case since you have received an opioid drug (morphine) so it sounds like this is most likely morphine related. This should get better soon. You may also try to drink extra fluid and this should help in passing urine. You may also apply hot compressors over the lower abdomen corresponding to the bladder region and this may help in emptying the bladder.
If this is morphine related then this should get better soon, if you do not see improvement in the next 24 hours or so then you need to see your doctors so that they can explore any other possibilities, although this is most likely related to the morphine use itself.
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