phone is bricked help please

i was planning on flashing a custom rom on my galaxy s6 today but at work i watched a video on how to get twrp recovery, so i downloaded it on to my phone, followed every direction and step using flashify then when i installed twrp and rebooted my phone it got stuck at the boot load screen, i cant even go to recovery mode nor download mode, everytime i hold the power button and volume rockers it just cuts off and boots back to boot loop cuts off boot loop and so on, idk what to do can someone please help :(