I'm Dr. Jo and I'm a veterinarian with more than 25 years of experience. I'm here to help you with your question about your cat being so jumpy. I'm sorry this is happening and has you worried, but glad you're looking for the information you need.
You may ignore any automated prompts for a phone call, or if you like, I can be available for that as well.
Yes, you are absolutely right. When a cat goes through something that really startles or alarms it, it can remain jumpy for several days thereafter.
Also, being jumpy in response to noises is not a sign of any specific type of illness or anything else.
Therefore, when this happens, the most common explanation is that something spooked the cat.
As long as he's eating, drinking, going to the bathroom okay and is otherwise not showing signs of illness, it's okay to simply give this time.
Does this help to answer your question for now? I want to be as helpful as possible.