I've taken about 7 100mg tablets of sertraline, and about 6 panadol (acetaminophen)...is this serious? what will happen?

Trying to hurt self?: The number of pills you are taking at once plus your age suggests that you are perhaps trying to do harm to yourself? You should really get somewhere such as a hospital to be checked out. I don't know what the dosage is on the panadol (acetaminophen) but they can be very harmful to your liver and so i would suggest you get looked at and take your medication bottles with you.

What else....: ...Did you take with that? Depending on the strength of the Acetaminophen (panadol) and what else you may have added to this mix, you could cause serious damage to your liver and you will certainly feel awful from that much sertraline (serotonin syndrome symptoms). This is not normal behavior. You are hurting yourself. Please go to the emergency room, please get help for yourself.