More than likely, your high blood pressure was the major contributor to your unfortunate stroke. Had you not done the heaving lifting, had you not gotten your high blood pressure under control, you probably would have still had a stroke, just later in life. I am guessing by the way you sound that it was not a very serious stroke and you are regaining much if not all of your functions back? I work daily with individuals who have had strokes and multiple other acquired and traumatic brain injuries who do not get much back. The best thing you can do is to gain control of your blood pressure. When your doctor says you can work out again and utilize weights, focus on developing your body definition and maintaining your body fat % to around 10-12. You should be able to return to lifting again and you will see definition and even a size increase. Be realistic with what you can achieve and remember your health is far more important than building big muscles.
Something to think about, after incurring your first brain injury (and a stroke is a brain injury) your risk for your second is 3 times greater. After your second, the risk jumps up to 8 times greater. This is not meant to scare or discourage you, it is being said to help you think about putting things into perspective. Exercise is beneficial, helpful, and necessary if it is done right.
My best to you for a speedy recovery and continued good health.