When you introduce anything foreign to the body (blood steam), there is a tendency to knock out some essential nutrients and or minerals.
When the body lacks these nutrients and minerals, this is when anxiety/depression rear it's ugly head.
You can try Magnesium, Glycinate (it has to be glycinate b/c it's water soluble and better absorbed). It eases the anxiety along with other ailments caused from lack of minerals.
http://www.newtreatments.org/depression
This site if for depression but it has a good explanation
here is a symptom list for magseium deficeincy
If you have any of the following, you may be deficient in magnesium:
1 - heart arrhythmia (irregular heartbeat)
2 - muscular tension or tight muscles
3 - chronic fatigue
4 - depression
5 - night sweats
6 - muscles easily become injured, strained, or torn
7 - constipation (sluggish colon)
8 - muscular weakness
9 - muscle cramps in legs or feet
10 - chronic pain in hips or knees
11 - dizziness
12 - nausea
13 - loss of bladder control
14 - migraine headaches
15 - cold hands and/ or feet
16 - low or mid-back pain
17 - high blood pressure
18 - chronic diarrhea or loose stools
19 - carpal tunnel syndrome
20 - intolerance to stress
21 - over or underactive thyroid
22 - arthritis
23 - osteoporosis
24 - epilepsy or seizures
25 - crawling sensations on the skin
26 - calcification of soft tissue in the body
27 - attention deficit disorder
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