Was this a spirit? Please answer. Would like some opinions...?

No, you don't sound crazy. *smiles* Some kind of entity entered your home last night. If it upset you, it doesn't necessarily indicate a warning of impending doom on anyone. It can just make you feel that way. If it's still in your home and you're curious, find someone who can come in and talk to this spirit and see what's up. If not curious and is still there, burn sage all over your home. Burn it until the atmosphere feels stable again. Rolled sage or sage bundles.