Hello and hope you are doing well.
Your symptoms of seeing things could be due to sleep disorders “Nightmare” or "Night terror" disorders . Here the person experiences symptoms of bad, frightening dreams which interfere with his sleep schedules. This can be assessed by a sleep questionnaire and therapy is based on the severity of symptoms. Disorders related to dreaming could occur with REM sleep behavior disorders. Here the person acts out the dreams. If your symptoms still persist, I would advise you to discuss your symptoms with your primary care physician who may then refer you to a sleep specialist for further evaluation.
Hope this helped and do keep us posted.
Sounds to me that you are indeed having hallucinations. Some causes of them are: There are many causes of hallucinations, including:
-Being drunk or high, or coming down from such drugs as marijuana, LSD, cocaine (including crack), PCP, amphetamines, heroin, ketamine, and alcohol
-Delirium or dementia (visual hallucinations are most common)
-Epilepsy that involves a part of the brain called the temporal lobe (odor hallucinations are most common)
-Fever, especially in children and the elderly
-Narcolepsy
-Psychiatric disorders, such as schizophrenia and psychotic depression
-Sensory problem, such as blindness or deafness
-Severe illness, including liver failure, kidney failure, AIDS, and brain cancer
Since this has been happening to you for as long as 2 years I would go see a doctor, because sometimes if you wait the outcome might not be good. Especially if you've ever felt nervous, paranoid, and frightened, and should not be left alone.
You might want to look into the types of medication you're on as well.