Yesterday i saw shadows that i thought were trying to kill me, is this a panic attack or something bigger?

Hallucinations: You are having visual hallucinations. See a mental healh provider as soon as possible. If you can't, see your pcp at a minimum. If serious immediatley, go the the nearest er.

Maybe more: Usually, seeing things or hallucinating is not consistent with a panic attack. There can be several conditions, both physical and mental which can cause hallucinations. I would try and see a physician for evaluation and good luck.