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.
Again, only a trained doctor can diagnose the cause of your head pressure, as head pressure can be caused by anything from anxiety to brain tumors. 1  Tends to occur during periods of feeling stressed/anxious. 2  Tends to occur with other anxiety symptoms.  Tends to go in and out depending on your level of anxiety/stress.