Hello~I am sorry you are going through this depression. We have a wonderful forum for folks that have depression and issues like yours, you might be able to find the help and answers you are looking for by going there.
I will say, however, that if this continues, you really should see your GP, he/she may be able to prescribe something that will help bring you out of your sadness. Also, try adding a good, high potency B complex to your diet along with vitamins D, C, A and a good multi mineral, sometimes chemical imbalances in the brain caused bu not getting enough of the proper nutrients can cause this depression as well.
I hope you feel better soon.
I agree with talking to your GP if this continues. You do have some classic signs of depression and it is persisting. Depression is something that can be treated and can get better. :>) Sometimes taking the first step is the hardest. But it's time if this has continued for a long while and it is getting worse.
This is not to say that it's abnormal to have period of the 'blues'. We all do. I do. Where I'm melancholy, easily emotional and feel sad. Sometimes for reason and sometimes not. But it blows over. If yours doesn't blow over, then get help. Hang in there.
I think you need to consult a good psychiatrist
I am rather concerned you think the people in the youtube videos are talking to you. That sounds delusional to me. I suspect you may be suffering from schizoaffective disorder ie delusions mixed with depressed mood. OTOH I am not a mental health professional. However i did work for at least 20 years at a rehab center Many of the clients were people with major mental illness. I too suffer from depression so I know how terrible it can feel. I think you need to tell all of yours symptoms to a psychiatrist.
Sorry to hear from you. You should consult with an experienced psychiatrist. It may be a sign of depression.