Nausea with Mirena??

I had my Mirena placed in Jan and since March I have had random nausea. It has now settled into a morning and night routine and has become so bad that I actually threw up Monday night.

Then it hit badly today while at work.

I also missed my period this month (currently 12 days late) but the three tests I've taken all came back negative.

I dont believe I'm pregnant.

But has anyone had nausea like this? I'm struggling.

Waiting for a call back from my doctor