I guess happiness is a relative state. I apologize for not defining it. If MD or a DO is what defines happiness then more power to them. If indeed happiness is an MD, and that individual got into a DO, or vice versa, then does one really need to question about what to do in such a situation? That is, if the ultimate goal is to get one of the degrees, and in pursuit of happiness, do they need to think twice to achieve that goal?
One thing I see often here are students who ask, DO vs. MD? This of course, degrades into a flinging of insults back and forth until the OP is just more confused than before- it's counterproductive. Theres nothing wrong with a healthy debate, but more often than not, it's about ego, and who's treading on them. These debates are often fueled mostly by passion, and usually less about figures and facts. This is why DO vs. MD threads are rarely welcomed anymore as an educational function.
Happiness is often (not always) absolute, instinct will tell you if you are happy...or not. When it comes to choosing DO vs. MD, it only can really be answered by doing a little soul searching and finding out, What Makes You Happy? If its things in my abovementioned post, then its clear cut that you should do what it takes, independent of the degree, to get there. If its a matter of the actual degree, then it should be clear that a reapplication is in order. Of course, life is a mix of both, but the only answer that can be elicited is that found within yourself. All I'm saying is, don't get so worked up over what other people tell you (such as an anonymous forum). As xylem said, other's peoples opinions should matter very little in your quest for content. If, of course, your happiness is defined by others, you may need to do a little reordering of your priorities. Ultimately, do what makes you happy. You'll figure it out yourself by listening to your instincts. If you're confused, posting on here will probably make you more confused. The best way to answer this is to follow in the footsteps of both types of physicians and see if their lifestyles can apply to you and sway you towards one decision over another. A philisophical debate about happiness, if degree, or life in the future, or whatever defines happiness cannot be answered here, and shouldn't be answered here.