A Brooklyn teen who drowned in the waters off Coney Island near the iconic Cyclone rollercoaster had autism and epilepsy — and suffered a medical episode in the water just before he went under, his heartbroken mother said Monday.

Jun Alexander Obas, 18, was with his mom and two sisters enjoying his first ever day at the beach last Wednesday afternoon when he apparently drowned, his heartbroken mother, Karla Judith Obas, 39, told the Daily News.

“He wanted to enjoy the beach,” Obas said in Spanish. “He was asking a lot. We never went to the beach with him because of the epilepsy.”

Despite her concerns, Obas relented because her son was so excited by the idea.

“This is the first time we went to the beach with him because I was always afraid of the water with him,” she explained.

The o

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