“Should I go to the ER even though it’s been over a week”

I was assaulted by being hit in the back of the head with a large metal tool. I did not lose consciousness, I was able to leave the danger area and I immediately laid down because I was in pain. When I woke, I vomited. I immediately chose to go back to sleep. I vomited one more time when I woke again, I was experiencing extreme vertigo and I lost hearing in my left ear. I slept for multiple days in a row, I felt as though I was running a mild fever, when I was able to lay down in a tub to wash the blood out of my hair, the water was heavily red brown. I have painful pressure in my forehead, and have been experiencing sciatic nerve pain. I’m starting to feel better, I’m not as unbalanced but I still have no hearing on my left side and my head is still feeling painful pressure when I go from sitting to standing. It’s been over a week, should I still be worried about anything or am I alright now that I’ve made it this long? I need to know if I should go to an er.