Souliman's advice is sound: get your blood pressure checked, eat right, and get plenty of exercise.
I was on Celexa for three months at the beginning of my quit. I was hit mostly with depression and insomnia. What you're describing could very well be related to your quit. Many quitters have struggled with anxiety.
It's not too difficult to understand why many of us get hit this way. While we were on nicotine, we were fooled by our addiction into thinking that nic was actually helping us through those difficult, anxious or stressful times. In reality, all we were doing was feeding our addiction. Unfortunately, that meant that we never really dealt with the issues that were causing the anxiety or stress.
When we quit, we are finally forced to deal with those issues and we are definitely out of practice. In short, we need to learn to deal with life's issues all over again rather than avoiding them by pumping our systems full of nicotine.
We also need to learn to relax. Nicotine had me fooled into thinking that I couldn't relax without a dip. It had me looking forward to the last dip of the day, when everyone else was in bed. I would fill my lip, sit back, and think to myself that now I could really prop my feet up. But, again, that was all a lie. All I was doing was satisfying the addiction. I certainly wasn't unwinding.
Finally, at your stage in your quit you are physically free from the contamination of nicotine in your body. However, it takes longer to recover from the psychological damage of the addiction. You are still facing issues, circumstances and triggers that once involved dip in your life, but now you are facing them without the dip. Generally speaking, I think it takes a full year of quit to get most of this behind us. Each season of the year brings with it new triggers.
Keep quit, brother. You will get through this and you will find life to be much better as you progress!!