Is it a neurological disorder. Disorder!

Recently I have been getting this random spikes of fear about death and how we have come to this world alone and will also leave everything behind without knowing what lies ahead. It scares me to bones and sometimes I have dreams where I repeatedly keep on waking up on dreams which makes me feel I have died in the midst of sleep. After waking up, it takes a lot of time to distinguish between reality and Dream. I get palpitations hereafter accompanied by shortness of breath. I often feel like something is wrong with me and my time is ebbying away from me. Life hasn't granted much time for me, that's what I feel. I don't get  peaceful sleep and I'm always tired and find It hard to Concentrate on my works, studies. There are days I don't brush my teeth for days or shower or push myself to do good just because I don't have the energy to do so. Lately, I have been suffering from mild loss of balance as well and I can't really conclude if it has anything to do with any neurological disorder