I am surprised that your second attempt at filing was not also rejected, since the IRS knows that you should have attached form 8962.
Yes, they will charge you interest on what you should have paid by April 15th.
In the meantime, create your amended tax return (1040X), and e-file it. This time, before you hit Send or File or whatever, take a deep breath and ask yourself, "Is this return correct?".
Although there is no deadline on this, you are motivated to do this sooner than later, because the 1040X and the payment with it will stop any further interest being charged.
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