Was there no way out through the door on the right that you remember? You definitely sequence broke like Fignuts said but most of the sequence breaks end up with alternative, albeit difficult, alternate routes out. I'd maybe bomb jump back up there (I know, timing is painful, it still is in Dread) and check out the other room again for a destructible block somewhere or another place you can bomb jump too to proceed.
Or hopefully you have a recent save like Fig said. What platform are you playing this on? If you are emulating you can always just edit your current save to refill your super missiles.
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