I am 25 years old and am suddenly experiencing incredible sadness that i've never felt even in situations of family death. I feel sadness physically! Through my body, it's strange. I can't eat, sleep or even concentrate in a conversation. I feel like I am dreaming all the time. Or the feeling you get when you have had a bad dream and you feel strange the next day. I feel sick all the time as if i've heard some bad news. I can't control my terrifying thought and visions of death. Of me growing old and dying. I don't know if this feeling is because i am joining company and am scared of being a professional. I am currently taking antibiotics. Could they be effecting my hormones or chemical imbalances? I need to know how to control my thoughts and get back to normal.