Can I ever get over it?

I don't know what is wrong with me. I try to tell myself that its ok every day, but it just so happens that i can't get over it. I try so very hard not to think about anything bad or depressing but it just comes back to me. I started feeling this way about a couple weeks ago and had a severe panic attack and went to the hospital for. The hospital didn't really give me any satisfaction at all. They gave me these sedatives and I have taken them but they make me feel a little worse. I feel either sad or just emotionless for somereason and I can't do whatever I want anymore without feeling anxiety or something. I may be going through a lot but everything couldn't be going better though. I made the marine corps band and I leave for boot camp in a few months but I don't know whats wrong with me. I will even break down and cry a little bit idk why but its just saddening in some ways for me to feel like this. I have allways felt spontanious, and very heartfull towards everyone but I just don't know. Could someone shine some light on this problem? I'm 19 and my doctor said there is no reason why I should feel like this at all. Thanks for your help guys and gals. Much appreciated.