I have had these extreme feelings for the past 4 days that I am going to hyperventilate or quit breathing. I have started to feel shaky from time to time, sweaty feeling, somewhat unreal feelings. When I first wake up in the morning I am fine and then as the minutes tick by the feelings start to come. I take zoloft (for years) and I have xanax prescribed as needed. I have taken the xanax and it takes some of the edge off, but its still there. Does anyone else experience this? I feel so alone feeling this way!