I am at risk of losing my health insurance because my tax return is still in limbo with the IRS, what should I do?

[Critter-3]

If you mean the Obamacare insurance don't let that letter bother you if you have already filed, included the 1095-A on the return  and the return is still processing. There is nothing you can do until the IRS processes the return then the insurance company will be fine.