AFter taking Levoxyl for almost 6 months, I suffered severe anxie...

AFter taking Levoxyl for almost 6 months, I suffered severe anxiety--couldn't sleep, cried all the time, at times couldn't leave the house and other times couldn't stand to be at home. I suggested to my dr. it was the Levoxyl, but he didn't agree. So I took myself off and finaly felt like my old self. Now my thyroid is low and they are wanting to put me on synthoid. Is it any better? I can't go through that again and Is there any natural thyroid medication I could try?