In agricultural tractors for example, as a general rule 40 to 50 percent of the value of the machine will be lost in the first quarter of the machine's life and by the halfway point of lifetime, from 70 to 75 percent of the value will be lost.
People with PTSD may feel constantly alert after the traumatic event. This is known as increased emotional arousal, and it can cause difficulty sleeping, outbursts of anger or irritability, and difficulty concentrating. They may find that they are constantly on guard and on the lookout for signs of danger.
I went to the ER about 5 months ago with shortness of breath, some tightness in chest, warmth and tingling at the back of my head and confusion/dizziness. I underwent an EKG which was normal, bp and pulse were normal for the duration and I was discharged with diagnosis of anxiety, but I think that it was partly a reaction to constant high levels of caffeine.