Animals helping with disorders

I've struggled with depression and anxiety my whole life, my mom also recently passed away and it made things worse, I've been in a really abusive relationship that tore me down also. 
Lately I noticed the only way I find happiness is through helping animals, I volunteer at a horse rehab center and something about seeing their progress when I help them really helps me.
I took in these two dumpy frogs that were surrendered to the rehab because they were the size of dimes and the owners kids didn't want them anymore.
both those frogs are the size of my fist now and healthy because I got then there! Even though I end up killing half their crickets before they get a chance to eat them!! those things don't work well with a sleep schedule. 
Anyone else seek relief through animals?