Nightmares

So I’ve had horrible nightmares almost every night for as long as I ca remember but they’ve gotten even worse lately. I’m not on any medication but I have dealt with anxiety, depression, and PTSD in the past and I have a really hard time sleeping so I’m assuming it’s because of those things. Does anyone know a way to stop it? I just can’t handle it anymore. I wake up every morning with my heart racing and feeling distressed. :( I hate it