Crazy Bathroom Sinks Bathroom Sink Clogged, Used Sulphuric Acid, Now More Clogged! Ideas?

Bathroom sink clogged, used sulphuric acid, now more clogged! Ideas? - crazy bathroom sinks

I sink bathroom, clogged regularly - it was pretty bad. Caustic soda has tried, with little success. Lately, he has been very bad, so I finally took a clean shot times (think especially sulfuric acid) that should do the trick. I was in some, he started behaving like a madman, and left me alone, so when the time came the sink clean is that it is almost completely blocked.
I then take the trap under the sink, made him look good, but not locked. However, the water will not run over the sink.

What could be causing this? What should I do?