My doctor recently increased my zoloft from 50mg to 100mg. i just called 911 because my heart rate is 120+ the paramedic told me my vitals are fine and i dont need to go the er so i am laying down. is this a normal response to an increase of zoloft?

Zoloft can increase the heart rate, especially when the dose was abruptly doubled. That side effect is most likely benign sinus tachycardia which should gradually settle down. Don't take any more Zoloft until you get instructions from your prescribing MD. If your heart rate remains over 120 or if you're experiencing other uncomfortable effects, I recommend being checked in the emergency room

I agree with the answer by Dr. Colantino. You did not specify if this medication is being prescribed by a Psychiatrist. If not, I suggest you switch to one and if you are already seeing a Psychiatrist you may want to switch to another who is a better fit. Also, it is very helpful to combine meds with psychotherapy by a Clinical Psychologist with expertise in multiple types of psychotherapy.