Help! How can I turn off my lamp without getting electrocuted?

I have a lamp on my side table , I turn it on daily before bed. I leave it on all night as a night light. Last night I used a duster to dust the egdhes of the lamp & now Some reason since this morning when I turned it off , I felt a small buzz on my finger and tiny buzz noise. And the light bulb inside flickers.
I turned it on now and again same buzz on my finger and my finger hurt tiny bit. Now I’m scared and will need turn it off and get rid of it but I’m scared he electructed if I turn it off. Also few days ago water began drip on the outlet where my lamp is connected when I turned on my ac , I don't know if that’s y my lamp is buzzing or due to me cleaning with duster?
Help! How can I turn off my lamp without getting electrocuted?
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