Do I need to see a psychiatrist?

I see, feel and smell things that are not there. For one thing I see dark human shaped figures in my peripheral vision, but when I look its not there. And sometimes objects like trophies start moving/morphing, but it all stops when i quickly look directly at it. Yesterday I saw something with curly black hair sitting on my sofa. I closed my eyes and looked again and it was gone. And almost 2 times a day I see something like a snake or something weird, but it turns out to be something else when i look at it a second time. And i smell different smells every once and awhile. And every once in awhile i feel ants crawling all around me, but nothing is really there. I am severely depressed and have been for 5-6 years