pc making a weird tapping noise

Your PC is trying to claim the alpha position. In order to save your status and authority - tap back. Or in the best case, launch your foot at its most vulnerable area. Works every time.

Something hitting the moving objects.

Open the case
Run it

try to find from where the sound coming from. This type of sound used to happen for CD-ROM incorrect insertion but it can be a leaning wire moving with harmonic motion and hitting the CPU fan or the case fans. It can be dangerous if you ignore.

that's one heck of a covid symptom.