In response to your question "Is it normal to feel depressed after you quite smoking?"
Addicting artificial chemicals destroy the natural “feel good” brain chemicals called neurotransmitters. The brain responds to the presence of artificial addicting chemicals by making fewer of its own natural neurotransmitters. When the brain’s ability to make its natural neurotransmitters is suppressed, you’re compelled to find the artificial chemical to fill those receptors in your brain. Something has to go into the receptor sites to keep your mood even. The absence of anything to fill these receptors causes the unpleasant symptoms known as withdrawal.
Deppression is a symptom of withdrawal. while you smoked the receptor sites were being filled by the addicting chemicals. your brain detected their presence and decided it no longer needed to manufacture these mood balancing neurotransmitters. Why? because it was already there (artifically).
The solution is to help your brain to begin producing these neurotransmitters again. In the absence of smoking your brain will eventually learn how to produce it's own neurotranmiters again however, while this is happening you will experience the unpleasant symptoms of withdrawal.
Please be assured that “cutting down” or even stopping has very little to do with your personality, mental state, or “will power.”
It is mostly biochemical.
Since it is known which neurotransmitters are displaced by nicotine and we know which nutritional ingredients are used to synthesize each neurotransmitter it is a relatively simple process to design a biochemical recovery plan to restore our internal support system.
Your Depression or, any other symptoms of withdrawal can be reduced or eliminated within 24-72 hrs.
This treatment plan is complimentary to use with other modalities such as hypnosis, lazer, accupuncture etc...
You also mentioned that you are now on a anti-depressant. unfortunatly it will not solve your problem however it will mask your symptoms but not eliminate the cause of your symptoms.
If you are interested in a biochemical recovery plan I can let you know what nutrients and amino acides to take as it applies to smoking cessation. I would just need to know the name of the drug or drugs you are currently using and if you have any other health issues. eg. High Blood Pressure, Thyroid, etc...