1. Yes you (and/or ) your husband should be proactive about their health and ask questions for anything that is not understood.
And that includes asking about any changes in meds. What i9s the purpose of this meds, how does it work, how soon does it work, what are common side effects, and any special ways of taking it (such as only at meals, or without milk, etc).
2. I don't know the "tone" in which you ask the question, but it is reasonable question.
Blood pressure is check by pumping up the pressure until no sounds are heard and a little about that. Then the pressure is slowly released and the point at which the sound is first heard again is the systolic are first number. Then pressure is continued to be reduced until the heart beat sound goes away. That point diastolic pressure.