I'm 25, and I find that many times throughout the day I worry and fixate on dying.... whenever I laugh or joke with my parents or other people important to me, I get this...idk, impending sense of doom?  


Maybe it might be grief? I've lost two aunts due to cancer, and it happened back-to-back (over a year apart, in fact). That might be why my mind is revolving around this concept of dying. I tried to sit in the park very recently (my 25th birthday in fact) and I was so tense. My mind was racing a bunch.   


Recently, I remembered one time at an old job I had, where two customers were discussing that someone they knew had passed away suddenly despite being healthy/in shape.... I forgot about that until very recently. My anxiety has been spiking ever since then.   


I have no idea how to calm these thoughts. I try to exercise and eat properly, but then my mind is recently jumping back to that conversation I overheard.   


How do I calm these thoughts down? I keep worrying that I will end up being part of a statistic.