Goodness me...you are speaking my language. This is quit number five for me. I've returned EVERY time to the smokes because of these nasty withdrawal symptoms. All of them collectively...but most specifically, I turned extremely miserable at the 30 day mark and seemed to stay there. I quit once for 8 months and finally told my husband that I'd rather die from cancer, with a short life...then live forever as a MISERABLE, UNHAPPY non smoker. I convinced myself that smoking was the better option...BUT IT'S NOT. Think about it. It's just a little stick of paper with stuff in it...you light it up and blow it out. That's it. Not even a good buzz attached to it!!! You'll run everytime it calls you...above and beyond any other person or thing. Why? Because you are addicted to it. You think you like it...you think it's your friend...because you want to...you are an addict, after all.
I was so afraid this quit. I wanted to pass 8 months and see how much longer I had to continue before the craziness went away. Turns out that I learned a great deal from this site. There is hope. The feeling of despair or unhappiness is a documented side affect that is related to something called "dopamine". I'm not going to reiterate the entire article or post (By Shevie)...but I highly recommend that you have a look.
Your success is up to you...you must do whatever you can to get past this and return to a normal...healthy life. Many have done it before us...many will do it after us...Therefore, it IS a possibility.
Good luck to you my friend. I sincerely relate.