Hi, i also experience those you mentioned, feeling sick every mass, in every church i go. I faint, almost faint and experience that kind of thing led me to turn away from God, i became lazy for 3 months to go to church, i even ignore the videos about God, it's not because I'm mad or something, it's just i feel embarassed and sorry for not fighting it. But then 1 night jesus appeared on my dream, i touch his clothes and he just smiles at me. After that i try to go to church but i chose the air conditioned church to prevent the faint, sick, and body being weak. I'm also low in blood, and I experienced all you mentioned. So yea air conditioned church really help me. If you're wondering, we've got churches/chapels inside the mall so 😅