Why am I still lightheaded and filled with anxiety after quitting smoking? Why am I suddenly hopeless/scared?

Wow...rest ured you're not crazy and NO you won't have to live like this forever. I was a smoker as well and quit about 6 months ago...I'm 29(almost). Your symptoms are all very common. Some people react differently than others so these sides effects might last longer for you. Being around the smoke...especially second hand can send you back into withdraw...it did me. It's best for you to avoid it whenever possible for the first couple of months. Some can quit and other people smoking never bothers them, but we all aren't like that. As for the anxiety...if you are prone to it with the smokes it will get worse while you're "detoxing" for lack of a better word. There are plenty of behavioral/herbal remedies you can try if that's what you choose. St Johns wort, chamomile tea, EXCERCISE(it really helps relieve the stress) breathing techniques...etc.. However that doesn't work for everyone either. If you're not finding improvement with those....sounds like some help via anti anxiety meds or an anti depressant might be beneficial. That you'll need to talk to you doctor about. It seems they have checked lots of physical causes and you seem pretty healthy..be patient and don't discount counseling and a prescription if necessary.