I keep getting nightmares, my heart beats very slowly, I cannot sleep, and my body temperature always feels ice cold. I've been suffering greatly over the past week from a traumatic experience, and generally don't feel like I am alive.
I don't know what to do to help my situation anymore to be frank. If you friends could give me a suggestion, it would be wonderful. Thank you all.
This is probably not what you want to hear, but see a doctor.
As a long-time sufferer of nightmares, insomnia, and depression (clinical, chemical imbalance depression) I feel as though that is the best advice you could be given at this point in time. And listen to what he has to say, don't just blow him off like I did for many years.
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All you perceive with your senses and everything you experience (even what you dream about at night) is essentially interpreted in your brain and affects how you 'feel'. There are certain chemical reactions in your brain responsible for your mood, such as the feeling of joy, pain or suffering. It's all in your brain. When a chemical imbalance occurs in your brain, you start feeling as you do. Go see a psychiatrist, he can help you. If he doesn't, go see another one. Many psychiatrists are not even remotely good in what they do (first hand experience), so if you find a one that sucks, keep looking.
Or in case you don't believe in science and modern medicine for some reason, go see a psychic and do everything she tells you. Might work just as well, in case you really believe in that shit.
Going to have to suggest that you see a doctor, especially since your situation seems so severe, based on your description. We're not going to be able to help the way a medical professional can. Closing this.