It seems to be hypochondriasis leading to insomnia. It needs to be treated asap otherwise it may get complicated. It can be well treated with counseling sessions and medication if required.

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Prepare yourself to become a stronger person by accepting criticisms.. Those are there Opinions at thr end of the day.. Whatever you have posted in the social Media that  was your Opinion.. Each one of us has the Freedom of Expression.. Hence, continue your contribution..