"I really am in love" would be used more if someone was questioning. I.e. "You're not really in love, are you?" "Yes, I REALLY am in love!" (The emphasis would be on the word "really".) "I am really in love" tends to be used to express how MUCH one is in love. But they can also be used interchangeably, so you have to get that from context.. Same with your second example. In the third scenario, "I am really going to be in a bind if he calls me today." tends to show the seriousness of the bind you are going to be in. However, in the U.S. we would not put the word "really" in the place you have in that last sentence.