If you filed your own return as Head of Household you did all that you needed to do and can do. You cannot claim yourself as a dependent - there is no such thing.
Once you file your return as Head of Household no one is able to file another return in the same year claiming you as a dependent and no one can do anything to scam you out of your economic impact payment (stimulus check.)
If you have not received your payment yet, it may simply be that you are just one of the many taxpayers that the IRS has not yet gotten to yet in the processing.
If for some reason the IRS isn't able to process your payment by the end of 2020 (because they don't have enough information or the right information to reach you), you will be able to claim your payment when you file your 2020 tax return in 2021.
@kelmcicero
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