You could possibly ask the person that prescribed it wether you can start at a lower dosage. I think they would understand your fear and will help you to get over it/start more progressively.
Anti-depressants act very differently from one person to the next and therefor it is very difficult to tell someone else what it is like. I can tell you from my own experiences that :
1. It takes a while to adjust to the medication
2. The first dosage will invariably be changed by the person prescribing it, a couple of times before it works the "right way".
3. The person that prescribed it would no doubt have told you that you should feel comfortable to contact them any time of the day/night if you feel adverse effects from the medication.
4. The medication takes a while to kick in and it is therefor very important not to miss a dosage or just "take them when you feel bad". In fact, once you start, you should not stop without consulting the person that prescribed it.
5. Return for a re-evaluation often so the dosage can be adjusted if needs be.
I'm on chronic medication for depression and am forced to be re-evaluated every time the prescription gets re-filled. I must admit that at the beginning you might feel strange and not truely your self, but that is more than likely because of the fact that you are not used to feeling "normal" if that makes sense.
I hope this helps and I wish you all of the best. The medication does help...not necissarily 100% @ 100% of the time but it definately softens the blow when you need it the most.
I wish you all of the best with the treatment!