Sorry for the very late reply, I'm wondering how you're doing with this now that it's been a year. Anyways, I really think you should take to heart what has been said above.
One thing you should definitely worry about: You are mixing NyQuil with Tylenol. Tylenol is a brand name for acetaminophen. You should look into information about a drug before taking it, prescription or not. Under the label of NyQuil cold/flu (the only one I have personally taken) it mentions that you should not mix NyQuil with acetaminophen, because NyQuil already has quite a bit of it in it.
There's a reason that there are dosages on drugs, it seems that you have already started to hurt yourself with it and that you've already become addicted.
About doctors, talk to your regular physician about looking in to sleeping drugs. Please only take as much as you are suggested to, as medicines are NOT something you should play games with. If you feel that you need a raise in your dosage, talk to your doctor!
Also, look into that anxiety problem you have. There's no reason for you to need to drug yourself with NyQuil to calm yourself down, if your anxiety is that bad, your doctor will have another solution for that.
Try and get some help for your NyQuil addiction, talk to your doctor about that and see if your anxiety could be linked to depression.
Your insomnia could be linked to either depression, anxiety, or how your body has become dependant on Nyquil. It's a package that tends to come together in some form.
MAKE SURE to give ALL of your symptoms and experiences to your doctor, no matter how nervous/ashamed/embarassed you are about your addiction and its side effects. This will be the only way for you to get the proper treatment and find out if you have any serious damage from the drug combinations and whatnot.
I hope you're doing well, and although I know that you don't have a doctor in your state, try your hardest to get in touch with one.