Awww (((Steve))). I'm sorry you are going through this. It is a very difficult feeling to live with.
A lot of people feel this who haven't been involved in a doomsday cult, but being in a doomsday cult is certainly a very good reason to have these symptoms. The MSN health site suggests that you are experiencing anxiety and stress which is leading to these feelings.
Nervous system. If your fight-or-flight response never shuts off, stress hormones produce persistent feelings of anxiety, helplessness and impending doom. Oversensitivity to stress has been linked with severe depression, possibly because depressed people have a harder time adapting to the negative effects of cortisol. The byproducts of cortisol act as sedatives, which contribute to the overall feeling of depression. Excessive amounts of cortisol can cause sleep disturbances, loss of sex drive and loss of appetite.
For me this feeling happens when I am depressed, suffering acute anxiety, and feeling overly stressed. Surely this tied to a lot of my childhood problems and the constant fear that Armageddon was looming ahead. But not only was their the Big A to fear, we also had the Great Tribulation to look forward to coming before the final war. It's promise was starvation, beatings, persecution, temptations that we must resist, and the mental pressure of living in an underground society where any misstep could lead to exposing our friends and loved ones to torture by the government and police. Anybody we knew casually in the world and liked, including co-workers, relatives, doctors, hairdressers, and barbers, could now become our enemy and persecutor.
Fear of the government is a very big problem for me. When I got a call for jury duty recently, my first instinct was that I was being setup and that it was a trap. Then rational thought took over and I realized it would be okay and a chance to show my patriotism... and to learn be more normal.
Counseling has helped, along with medication for anxiety and depression. You may want to consider going to your doctor for meds and a referral to a therapist if this feeling becomes inhibiting to your enjoyment of your daily life.
Tammy