Actually Mike, you will make a wonderful dad! Yes, men can experience hormonal changes when their wife is pregnant. Your worries are prefectly normal....
Think abou it...you are your wife will be bringing a life into the world so it is understandable that you have focused on others regarding their health, life & death, etc.
Actually when we were expecting our first child, my husband gained weight and had odd cravings just like me. The only thing is that he did not give birth.
Congrats!