Levothyroxine Sodium and 10 years

I have been taking levothyroxine for about 10 years now, i have had the following symptoms with them, weight gain, hair loss, mood swings etc, but i can also put it down to having a Mirena coil. The main thing that has concerned me is that i started to have panic attacks over a year ago with severe depression to go with it, my life was fine before that, had no problems, 3 wonderful children, my life was great.
Does anyone know of any other medication/natural products we can take?
I'm just so fed up with feeling like crap all the time.

Hi, i have been taking Levothyroxine for 10 years now, and at the moment i have been prescribed 100. Four months ago I start having horrible panic attacks and my anxiety have increased since. I went to a private doctor and she stated that everything is happening to me is because of the Levothyroxine and i should change to natural. I am not sure what to do , i just really want to feel good without this horrible anxiety!!!!!!!!!!!
What i should do?????