Levothyroxine Sodium and anxiety

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?????

Started taking Levothyroxine 100 3 weeks ago, for last week I'm in agony, my joints and muscles are sore, specially legs and arms, got constant headaches, mood swings, I'm also short of breath which developed before muscle pains, went to the doctor, was told it's probably asthma (!!) got tablets and inhalator and he mentioned anxiety, when muscle pains started, went back, was told that it's not related with hypothyroidism or Levothyroxine, it's a virus (??) have to drink plenty of water and got Diazepam and link to anxiety website. Help, it's not stress related! I don't know what to do!! Does anyone know how to get rid of those pains?