Panic attacks half the day, work 12hr, little sleep. Can this cause heart attack young female. Been going on long time. Numb body & aching for weeks.

Heart attack=no. You can obviously get worked up to the point of exhaustion & feel like there is no way to stop it. You have also realized you need help which is the first step toward recovery. See your doc for an initial evaluation ( some health issues can aggravate this) and then s/he can refer you to the local source you need for treatment. You can get this under control with work.
Panic attacks. I understand your distress.
Panic attacks and panic Disorders are treatable with good success.
Please see a Psychiatrist for
• Diagnosis
• Therapy for stresses in your life
• Medication
• Breathing Relaxation
• Meditation
Your Emotional Health is Precious!