Auditory hallucinations?

*** VISUAL HALLUCINATIONS *** Not auditory

Not sure what's going on so I figured I'd ask here...

I've been taking Lexapro 20mg (generic) for OCD and depression for at least 1.5 years with no side effects. I've also been taking birth control pill to stop my period for 3+ years with no side effects.

For the last 2 weeks or so I've been experiencing visual hallucinations. It's like I will see a light glare or a small dark shape like a person or animal move quickly in my peripherals. I wear glasses so I assumed at first it's that but I've worn glasses for 15+ years and never experienced this before. It happens without my glasses on too.

It happens whether it's light or dark, whether I'm tired or not. I would say 5+ times a day I see something that's not there for a second. When I look it's gone.

I also use marijuana (have for 5+ years) for ptsd, ocd, anxiety and depression. It helps me calm down and actually let's me fall asleep. I've been wondering if it's that, but again, I still see these hallucinations whether I'm sober or not, and even if I haven't used it in a few days.

I'm totally lost on why this is happening!