What are the effects of common "all-nighters"?

Ever since I became unemployed, my sleeping pattern has become more and more erratic. I've gotten to the point where I am having 1 to 2 days a week, sometimes 3 of staying up for 30 or so consecutive hours. My sleeping pattern refuses to be stable. Generally shifting 1 to 2 hours later overall a day, even during weeks that I am not pulling all-nighters. While this is generally not having any obvious health effects on me, it has caused some mental instability and some "lagginess" even days after my last all-nighter. Obviously I should go get some sleeping pills or something, it is just taking me a while to convince myself to do so because honestly I try to stay as far away from pills as possible (my body seems to become very easily dependent on any and all medication... for example I had severe mental and physical withdraws from Oxycontin after only 1 week of use after a surgery). But I want to know is there any serious physical effects from this kind of sleeping pattern? Or is most of it mental and the interruption of the normal sleeping cycle? I heard it increases the chance of heart attacks, but being only 27 and I've been done with smoking for about 4 months now I am hoping such risks are minimal for me. I just hope that this kind of issue isn't having very adverse health effects because I honestly don't know how long it's going to take me to force myself to get treatment or force myself back into normal sleeping habits. It just seems like I simply am never tired enough to sleep after the normal 15 to 18 hours of being awake. Even after an active day, heck even after an 8 mile hike... I was still awake all night.