Is this work harassment?

There’s this guy at work, he’s in his late 30s and married. He’s a jokester and makes jokes with everyone. He's a playful character. He moved down to my department a month ago, and I started noticing his behaviour towards me. He pokes my arm, plays with my hand and pokes my stomach/rib area. I have told him to stop and that I don’t like being touched and that it makes me uncomfortable. For some reason, he doesn’t seem to understand and doesn’t take me seriously when I am. Whenever I speak to him about work related topics, he always switches it to make it sexual. When I explain something to him, he began laughing and I asked him why he was laughing and he didn’t say. I continued talking and he rudely told me to shut up. He later confirmed to me that when I was talking, he was having sexual thoughts. Made me very uncomfortable. Other times, he would grab my attention to check his work. He would ask me to check the patient name, and the patient's surname had an inappropriate name which I didn’t want to say. So I naturally stated to him “ Just write their last name down” and he looked at me with a smile. “ Just say it”. And I was like “ Excuse me?” And he was like. “ You can say it”. He was forcing me to say the patient's last name because it was a inappropriate word. he's always in my personal space; creeping up behind me when I’m not aware and leaning his face close to mine from behind. I don’t understand, he’s not like this with other people he just makes jokes when it’s necessary. But when it comes down to me, he makes sexual jokes random times, more flirty and touchy feeling. He doesn’t seem to understand and to stop, when I advised him to. Am I just overthinking or overreacting? He generally makes me uncomfortable and I don’t know what to do. I’m thinking of telling this to my manager because we don’t have a HR. The thing is, I don’t trust anyone at work. I’m just scared that when I tell my manager how I feel, it’s just going to be spread around.

Is this work harassment?
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