Timeline is visible but every clip is Black screen. Render timeline gone, and can’t press play

I have Premiere Pro 2019. This is URGENT since my project is due in a couple days. I must have did something when adding a video clip to my timeline but it just corrupted my entire sequence. I see the color-coded timeline, but all I see now is a black screen for every clip I click on, I can't press play, and there's no render red, yellow, or green bar up above the sequence clips. Can anyone help me? I will compensate you greatly.