My bathroom sink lost pressure…?

My bathroom sink has always had pressure but at times it didn’t drain properly, it would drain very slow. I poured drano into it one day and it seemed to drain better but not like it should. Just recently I took the u-shaped piece under the sink off thinking maybe there is something in it that needed to be cleaned out. There was nothing in it so I put it back on, only to find out that there was no pressure in the water afterward? Where did the pressure go? There is no water at all but a thin running stream, almost a drip really. Any suggestions on what to do?

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