So while I only went through a few days of pain or lung discomfort, I must address the moodiness. For me the moodiness came from the anxiety of not smoking. Smoking was my "self medication" and deep down I was terrified of not having that crutch. Kind of like climbing a wall without the harness and ropes, knowing that I'm going to lose my grip eventually. I had a full on anxiety attack over getting in the car with people who don't smoke for a road trip....so you can imagine the gut wrenching fear involved in not having cigarettes and trying to trust in an "unproven" system. The moodiness will subside over time. I think it just takes time to settle down and get comfortable with your new nicotine habbit.
A note on taste.... not only will your taste buds work better, your preferred tastes will continue to change over time. Not just food and beverages will be affected. Your choice in Nic juice will be affected as well, so keep that in mind. We also noticed here that our Nic juices change flavor as they "age." Most seem to deepen and become richer as they age. Haven't run into any yet that change for the worse.
I hope the discomfort passes for you all quickly. Hydrate and hang in there!