This is Dr. David
you should see a doctor right away.
you could be having inflammation and swelling of your prostate gland making it difficult for you to urinate.
at your age, it is very common for your prostate gland to be enlarged and swell up and make it difficult for you to urinate.
you should go back to the hospital and tell them you are having difficulty urinating and have them assess your prostate size.
you might need to use a self catheter to empty your bladder
and be started on medications to help shrink your prostate
you could have a kidney stone or bladder stone as well
see a doctor right away
and see if your prostate is enlarged
let me know if you have questions.