Hi and welcome nervousnellie :) I too struggled a lot with being very short tempered, feeling anxious to the point of just pacing around because I couldn't keep still in the early part of my quit too. I think it's just part of the price we have to pay to get ourselves rid of this deadly addiction. There are things you can do though to minimize some of these affects from quitting. Drinking fruit juice and keeping well hydrated. Eating as healthy a diet as possible. Seeing a doc up front may not be a bad idea. I didn't do that but having your blood levels checked up front might be good. Then they could check them again later to see if there's been any changes.
Stay close to this site and read, read, read. Watch the Joel videos too. The better educated you are about the addiction, the better off you'll be. I too quit cold turkey so it's very doable. It's not pretty but you just have to want to quit more than you want to smoke.
Take the daily NOPE pledge here too. Gets you day started off on the right foot. Coming to a place like this is also a great tool. I didn't even imagine it until I stumbled across this site. Have unconditional support from others who really "get it" it an amazing tool. Stay with us and participate. You'll see. The more you get involved, the more committed you'll become to your quit :)