Hey there! First off just know that worrying about these things is completely normal. There are a few ways, however, to combat anxiety and to take your mind off of things. I posted this on someone elses post so I'm simply going to copy and paste it here. On top of probably seeing someone qualified to help you out, what I do is Yoga everyday at least once or twice. I use yogamazing from Itunes and download various episodes that are designed for different purposes...find the ones that work for you. Yoga calms you, works you out, stretches you out, and focuses on regular breathing. Yoga has also been shown to increase levels of GABA which reduce anxiety and calm the mind and body. All that being said, yoga has tons of benifits. I also meditate at least once a day for at least 30 minutes at a time. I sit on my meditation pillow out on the front porch, light up some nag champa incense, and simply listen to the bugs chirping, the highway off in the distance or whatever sounds enter my field of awareness, or even sometimes just my ihales and my exhales. The key to this type of meditation (mindful meditation or sometimes called sensory meditation) is to find something to focus on and when you fall away from that sound or whatever it is you're focusing on and your mind wonders which it will, you simply bring your attention back, over and over and over. You'll start to become really relaxed and your mind will begin to calm. I usually meditate if I'm feeling down, but always at around sunset which is about 9:00pm where I am. You'll notice that when you're done with your session you'll have a heightened level of concentration, and your anxiety levels will be pretty non-existent. I'm always sure to do it a couple of hours before bedtime as it allows for my calm mind and body to completely rest when its time to go to sleep. Also by recognizing the benefits of your breathing, if you find yourself in a stressful situation or you start worrying, catch yourself worrying, let it go, realize there's probably nothing your worrying can do to improve that situation, and focus on your breathing for a few moments. You can use this technique of focusing on your breathing at anytime of the day. I also drink one to two cups of Yogi tea Kava Stress Relief in the evening. This tea concoction has wonderful benefits for relieving stress. Along with eating healthy, taking B-vitamin supplements and a multi-vitamin, drinking green teas throughout the day, and kava tea at night, with yoga and meditation I have left behind the anxious me and have become to know the very calm and clear-minded me. Hope you can take any of my daily routines with you to better yourself. Theoretically you'll have to deal with a particular person's death only once, so why live it out multiple times? Instead embrace the fact that you and everyone else is still alive. If you start the worried thinking try catching yourself and instead focus your energy on their well-being. I'd be willing to bet that that's more productive in all things than living thru their imaginary death and probably not healthy for your own body and mental state. Remember that death isn't real, its only a transformation.
Hope this has helped.
Namaste