my iphone has the spinning ball of death and I dont know what to do

Well, the story begins like this... my phone died while i was in a bar with my friends. I was the designated driver, so I often use the GPS for our location. Well anyway, it died, and I gave it to the bartender to charge. 2 hours later, I get my phone back, and its charged on 8% -__- we left the bar, and went into a mcdonalds to charge it. It charged fine, up to 50%, then I took it out of the charging port, and the screen was COMPLETELY black. I heard my messages, my ringtones and all, but I couldnt get the display on. When I got home, I searched for answers, how to fix the black screen, but I couldnt find ANYTHING that fit my situation. I have an iphone 4 7.1.2, and the home button is broken. yes I need an upgrade, but i'm not trying to do it now. Well not being able to enter DFU, or turn off "find my iphone" from my phone, I opted to just go to icloud and reset the device. My phone was able to open in itunes at this point.... (my phone is jailbroken) I was relieved that after I reset the device, the light came on as well as proper phone function. After 1 minute, the phone cut off and showed the apple boot and load logo for 60%, followed by the spinning circle. 5 hours later, I let the phone die, and reconnected it. Everything worked normally for 1-2 minutes, then cut off and resumes with the load/boot, then spinning circle. and the same process over and over... If I let it die, I have a 1-2 minute time frame to get my pc to recognize the device. I wish to enter DFU mode then restore it with a backup I created. I've seen almost all of the youtube videos...i tried the stupid paper trick for the home button, and reset but it didnt work. I'm pretty sure the worse thing I did was reset the phone while it was jailbroken.. it would've been easier to work with if my phone was with the dark light. Is my phone a goner? What can I possible do? thank you for reading