My screen has rolling green lines or just completely black help!

i just got hulu app and it wouldnt work on dex mode, so i used screen mirroring. first night, screen turned weird green but i turned off and restarted my phone. and it came back to normal. next night, i used screen mirror hulu again , and when got up screen was dead. turned off rolling green lines when power on. then black cant see anything. it goes back and forth between these two states. dex works. but its been overheating and crashing alot. imscared it may never be able to turn on again. and its my only phone and access to the intenet. because coronavirus i cnt go to the store to fix or replace. worry if do hard reset it might never turn on again or mess with my sim card.i did soft rest clear cache partition. vo help.