Feeling Shaky and Dizzy After Medication Change

I was just bumped from 50 to 100mg to of Zoloft about a week ago. I also just was prescribed Seroquel as needed for sleep, and I always take Vistaril for anxiety. Last night I took my Zoloft and Vistaril. This morning I woke up in a terrible fog. As I was sitting down, I got extremely dizzy, all the color runs out of my face, I can't feel my hands, I'm dissociated, my heart is racing, and I literally feel like I can't breath. no matter how hard I try... I feel like my lungs aren't inflating fast enough with air. I'm super dehydrated. I'm shaky and dizzy. I just feel like I'm going to die. I've been feeling shaky since the med changes. I don't know what to do. I almost called the ambulance before my husband calmed me down.