The reality TV star filed court docs Wednesday in L.A. County asking a judge to grant her a temporary restraining order against her hubby of 5 years -- Todd Gibel.

Our Christy sources claim Todd has been making life for her and her 19-year-old daughter from another relationship miserable in a number of threatening ways. For one, Christy says Todd has been impersonating her via email and shutting her out of her social media accounts. She also suspects he's been ripping up her mail.

On a more petty level ... Christy says Todd's been doing stuff like unnecessarily raising the temperature in the house to unbearable levels. For that reason and others ... Christy says she fears for her life and needs a force field between her and Todd.

The married couple has certainly been going through a tough time lately, as Todd has been battling depression. He told us late last month that he'd be seeking treatment to better his condition -- which he explained was severely affecting his marriage to Christy.

At the time, Todd said ... "Right now Christy and I still live together, but we are just co-existing."

There's been more drama at home, it seems, in recent days -- social media posts Todd's been putting up paint a picture of constant arguing over family coming to visit and their dogs.

Law enforcement sources tell TMZ, Todd even called cops late Sunday night ... complaining about Christy's pup not shutting its yap when her niece came to visit. We're told cops instructed them to figure it out amongst themselves.

They tried doing that by boarding all three of their dogs up for a day -- Monday, we're told -- but it appears Todd's now fighting with Christy about that too ... saying she's not releasing his own dog, Elvis, to him and holding it hostage against his will.