I think we "choose" our problems, based on our lives/lifestyle, past, and personalities, etc. Our spirit, mind, body, emotions, are all one entity and how we interact with ourselves and the world is what life "is". Just like we'll get certain medical problems based on genetic weaknesses and lifestyle, I think we get certain mental problems based on predisposition and lifestyle. I don't think we would do very well consciously choosing something else because we could only know that intellectually.