i was hacked? can i recover my items

i was playing aj watching some give away streams when my acc suddenly kept getting logged out with the message "i was gone for too long". this continued on and off for like 5 minutes when i finally just changed my password and logged back in. i noticed my spike was off my animal and check my inventory, everything valuable was gone (spikes, party, beta tail, etc). same thing happened with den betas, all my good ones were gone only leaving a few less rare ones. since then i have traded my way back up to a purple long but this is now all i have. is there any way i can get my stuff back?