Under the circumstances, it is very unlikely that you will be charged. There are two reasons for this. The first is that, like you said, you were under duress and other exigent circumstances. You were not trying to lie to the police to get your c.l. husband in trouble, but rather just wanting them to leave. It would be different if you called the police to your house then lied and request they press charges. However, that is not at all the case here. Instead this is clearly a case of the police interfering with your personal non-criminal life, and you trying to get them to leave you alone as they had no right to continue pestering you.
Second, the fact you told the police the statement was false supports the above, in that it shows you were not intending to lie to the police but rather trying to get rid of them, and once you did so, you acted reasonably in clearing up the record.
For these reasons, I'd say it's highly unlikely you'll be charged, and even if you were charged, you'd have a good defence by the sounds of it. But again, I really cannot see you being charged.
Hopefully that is of assistance.
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