just need to get stuff off my chest

My fiance went to the doctor's yesterday because he was light headed, shortness of breath and I guess he was puking. When he got there he was told he possibly had pneumonia. So they sent him over to the hospital for Xrays on his chest and blood work. His chest Xray come back negative and his blood came back fine. I guess they think there something wrong with his gallbladder which isn't a big deal but I also guess they found something wrong with his heart. So on monday he goes for a test but ever scent he woke up today he has been acting like him old self. yesterday he sounded like he was dying but today he wants to horse around and shit. I just think he was over tired from doing closing shifts at work and then the next morning opening. I think he was just worn out but he thinks I'm just being a bitch. I know your heart is nothing to fuck with and I'm not saying he shouldn't go get it checked on monday. If his test comes back that he has heart problems then I'm not sure how long I have with him because his dad died 2 years after his heart surgery but his dad found out in his 30's but my fiance is 25. So I'm just really scared but he don't want to talk about anything with me. We have been distance for like 3 months and I feel like we are falling out of love but now I really don't want to say anything until I know what's going on with him. Im just not sure what to do because I cry myself to sleep every night. When I say something he gets all pissy with me and says I'm just trying to start shit. I have been wondering if he is cheating because he don't touch me anymore and we really don't talk anymore. I feel like we are just friends now. The only thing we talk about is moving or about something on Facebook. I just don't know what to do at this point.