Welcome to HCM
We understand your concerns
I went through your problem description. You have nothing to worry. The fainting
episode in church you experienced is very common. It happens with so many people whenever they stand continuously for some time.
The reason could be empty stomach and loose abdominal muscles. Your case could be first one, because you were in church. Exercising your abdominal muscles should ease the weakness of that area.
Don't worry about that fainting episode, because that is not a case to worry at all. Weakness feeling could be associated with anxiety
after the episode.
Hope this clears your doubt. Available for further clarification.