As for the HBP, a stressful job can be a significant factor in blood pressure. This is not a myth. I know a number of people who have had their blood pressure drop (to the point of no longer needing medication) on leaving a very stressful job. Stress is a major factor, along with genetics, weight, activity levels and smoking.

As to medication, I have been on high blood pressure medication for years. I am not personally aware of any fertility issues with blood pressure medication. In fact, many of the initial treatments involve diuretics as the first step before going into anything even remotely heart related. Many "borderline" cases can be treated with just diurectics alone.

Now, depending on how high "HIGH" is, she should certainly get it under control even before considering having children. High blood pressure, especially if it is really high, is a risk factor for stroke and puts a major stress on all of the internal organs, especially the kidneys. While it might not cause immediate damage, really high pressure is a serious consideration (maybe risk?) for her and for any children should would carry. The unchecked pressure may be a greater risk than the medication to treat it.

Note: I am not a doctor. Depending on the pressure level, this should be brought under control as soon as possible. I am going with the assumption that borderline is above 130/85, high is 140/90, HIGH is 150/anything or anything/100, based on what I know of / have read about HBP.