Is my beta fish dying?

I got a blue male betta about a month ago. I was cleaning him today,which i do twice a week. And i noticed something hanging from him, now i dont know if that was just food or what. When he went to swim around whatever it was fell off. Now hes back in his original tank and hes swimming around like crazy. His fins are moving faster than ive ever seen him move. I was wondering if hes dying?
 
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