What Causes Difficulty While Urinating Post Suffering A Heart Stroke?

Hi, my husband had a heart attack a week ago. He is at home recovering, has been advised that there was no damage to his heart, and that he had to rest/take the medication etc. as advised. However, he has suffered the following several times: He has found it extremely difficult to urinate (says it`s as if there is a blockage). When he pushes to urinate, he begins to sweat and then finds it difficult to breath (he says it`s as if his airways are blocked) and he cannot breath. During this episode the muscles loosen and his urine is released and he is unable to stop it. About a minute or two after this he appears to be, and feels perfectly fine. What could be causing this? Could it be the medication? If not, what