My grandfather stooped down suddenly, but why?

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My grandfather stooped down suddenly, fortunately he was held by my grandmother protecting his head from the floor. That's what happened. While doing my lotting, I just heard a noise coming from my grandfather's room, and there we found out, My grandfather sitting on floor, he is complaining that he felt dizzy and all he saw was faded into dark that's why he is out of control. When I touched and helped him up, his skin is so cold, he looked pale and seeing not comfortable of what he his feeling. Looking at him physically he is not stable. I monitored his blood pressure and though the result was normal. Both my mom assisted him to the comfort room, there he vomits,my second thought was, do we need to rush to the emergency room and ask some help there? but I think I have to some assessment first before doing so, First I asked him to smile, to raise his arms and asked him some questions, he talked coherently, so I think it was not a stroke, I massaged his head for he complained of headache and we also offered him warmed water and warmed tea. My grandfather has a history of mild stroke , hypertension and have irregular heart rhythms. He was just admitted last October and prescribed with maintenance medications. We think of possible causes why did that happened, again maybe it was a stroke, but difficult to distinguish; another would be maybe because of what he ate during our dinner, it was already nine o'clock when we had our dinner and it was a pasta family type of food that is hardly digested by our stomach, he ate a lot and he sleeps immediately after that, or maybe because of his irregular heart rhythms,.. I can't think anymore of the possibilities, How about you? can you suggest any possibilities why that happened? Or any ideas about events like this situation?What did you do?