Is this possible?

Background:
I am 15 years old, male, and I have an IQ of 147 (yes, this is relevant). My parents split up during the summer of 2008. At this time my blood pressure was at a healthy level and I was not experiencing tachycardia without reason (ie exercise). The last time my blood pressure was recorded as healthy was in December. Not long after, on new years day, my father suffered a stroke* (albeit a minor one). This, in conjunction with the separation, was quite hard on me. At this time my sister began living at my mother’s, as I remained with my father. We would frequently have conversations about my mother, me, my sister, and real estate issues, some of which developed into arguments (don’t take this the wrong way; I have a positive relationship with my father). This placed a great deal of emotional stress on me. As the end of the school year approached**, I began experiencing episodes of tachycardia at school, as well as persistent diarrhea. I visited my doctor (about 1.5 months before the end of school) because of this diarrhea, and, while waiting for my appointment, experienced a very high heart rate. I naturally brought this up to my doctor and he referred me to a pediatrician (for both this and the diarrhea). My pediatrician ran all the tests he could (I am scheduled to see a cardiologist in january and I am scheduled for a renal ultrasound this fall), being the specific professional that he is, which all came back normal. These tests included an array of blood tests, stool samples, electrocardiograms, general vital signs, and chest x-rays. Over a period of three months, my blood pressure read as high (140-150 systolic and 85-92ish diastolic) at each appointment. When I told him I was suffering from a pulse visible in my eye, he prescribed propranolol (3 10mg doses a day, 8am, 2pm, 8pm) for me. That drug didn’t reduce my blood pressure effectively enough so I was placed on Lisinopril just last week. As I attempted to gradually reduce my propranolol dose I experienced tachycardia, so, after consulting an ER doctor, resumed my regular dosage. I am due to see my pediatrician this thursday.

*I was home alone with my father when he suffered the stroke, which took place during a huge blizzard. It was rather traumatic.

**I was stressed for exams, and I have horrible homework habits (I am a chronic procrastinator).
I forgot to mention that my Lisinopril dosage is 10mg once a day (8am).
Yes, my question is whether or not the stress in my life could possibly be the cause of my issues. Thanks for the non-spam response
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The propranolol was to reduce the strength of my pulse, because the blood vessels in my eye were, evidently, being placed under increased stress. Propranolol is used in the treatment of tachycardia and high blood pressure, so I can’t see why my pediatrician is an idiot; however, I’ll leave that judgement up to you though - you’re the professional.
Oh, I also find it hard to believe that a Registered Doctor plays pokemon diamond (I don’t recommend that you make your questions/answers public, otherwise you will appear as what you are, a sham).