Also, you're going to make mistakes and you're going to miss things. It doesn't make you poorly trained, it just makes you human. You'll have a few of those cases when you're newly out where you're just not quite sure what to do with them and/or you worry after you sent them home. If you're worried about them, give them a call the next day or two and check on them...there's nothing wrong with that.
I remember a peds case I had one time not far out of residency where the CC was n/v/d, 8yo boy. Mother brought him in and thought he had food poisoning. VSS, work up relatively benign. No leukocytosis, no traditional left shift. Reassuring exam, absolutely no belly pain after multiple exams with all the traditional signs negative. Kid is eating a popsicle, jumping and running around the room. The only thing and I do mean the ONLY thing that bothered me on the work up was an isolated bandemia of 18-20K. Everything else was stone cold normal. I agonized over that bandemia because it just fundamentally bothered me. I worried about occult bacteremia/sepsis, infections, etc.. He was just so atypical for appendicitis and I really didn't want to scan him for no reason. So, I call up our local peds center and...hell, I think they put me in touch with a peds hematologist or something. We went over the case, the diff, and she reassured me that an isolated bandemia was nothing to worry about. I found some literature that equivocated about bandemias in these types of cases and some would argue to obs them for occult infection and others would argue that this was antiquated thinking and that there was no reason to worry about them as much as in times past... Regardless, I let the kid go home. Very responsible parent and she assured me that she would go to the ER at the first sign of worsening sx and have the kid re-evaluated within 48h.
It was a friday. I was leaving on a weekend vacation and the whole way there I ruminated about that bandemia. I called the mom on Sunday and lo and behold... She said the kid vomited again and she took him to the pediatric center. They worked him up and were not very impressed and sent him back home. (Saturday). Sun, he develops a fever and she took him back to the pediatric center again.... Perf'd appy. Luckily, kid did just fine and mom was really thankful for everything and appreciative that I was calling and concerned but it just goes to show...these things happen. In spite of your skills and experience and in spite of your best intentions, not everything is textbook and you'll have some cases like above.
I forget what my point was with this whole story... I suppose I'm trying to say that it's normal to have a few cases where you're not 100% sure about the diagnosis and/or the dispo. That's normal and don't beat yourself up if you occasionally miss something. Most of the times, the pt does just fine. If you are really worried about the pt, call them up a day or two after discharge and check on them. Even today, I'll do this on occasion. They are usually very appreciative to hear from their doc.