When you are just engaged and not married yet, it can be hard to sit and talk. My husband is very adamant in taking me to the doc for every little thing as well, ALhamd he doesnt get loud or anyhthing but i know he does it because he cares. Its nice to have that feeling. BUT its certainly taking a toll on you. Maybe next time he is acting like that, tell him sternly that you are not going to talk about this until he calms down. I am not sure if this is the right thing to do for you guys or not, but its a suggestion. I never ever hang up but atleast give an ultimatum that you are stressing me out andif you dont stop, i am not going to talk until you are calmer. Hopefully this would get the point across. If not, then you may have to even hang up a couple of times. But only do it if you think he can handle this way. Some ppl dont do well with this kind of attitude and for them you need another way.
I did it! In the situation he always said that he's getting out of control and he is like putting his head in the front wall because I am taking things lightly.. He even once called my dad saying to took me to doc.. Twice I tried the trick you have mentioned by saying "ok fine I need to have some rest... Allah Hafiz" and then hang up the phone... which he called back in the next minute saying and explaining me that he's behaving in the way because I am lethargic, because I am taking things light.. Hope things are pretty better when me are face to face...