Hi,

My 3 year old male cat acts like he is depressed and sleeps constantly, doesn't play anymore and his one eye has a slight drainage.

He is eating everyday but is just not acting normal.  He has been like this for about a week now.

My question is can the cat get over this on his own and possibly be from the change of season?

Thank You Kindly...

 

Most likely FVR, especially if sneezing,coughing and bringing up mucous (although symptoms can be different and could be less if already vaccinated against it).

 

https://en.wikipedia.org/wiki/Feline_viral_rhinotracheitis

 

You can give antibiotics if it looks like it could develop into secondary infection (such as pneumonia).

You can vaccinate after recovery although the vaccination doesn't eliminate the disease, only lessen symptoms.

Of course best to get a vets advice if you are worried, but I have one cat who has had this repeatedly and stress seems to bring it on.