Why did the zoloft i take do this?

well it started out i missed a couple days of my generic zoloft, sertraline hcl, because i felt like it was making me feel worse. but then one night i was in bed i felt real anxious and could feel my heart beating so i reached in my night stand, grabbed one and took it without water and tried to go back to bed. but... show more well it started out i missed a couple days of my generic zoloft, sertraline hcl, because i felt like it was making me feel worse. but then one night i was in bed i felt real anxious and could feel my heart beating so i reached in my night stand, grabbed one and took it without water and tried to go back to bed. but later on my chest felt like it was burning. it was almost like my esophagus was being burned with acid right in the middle of my chest. this isn't the first time this happened but does anyone on here no what the reason behind this is?
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