My GP increased my med's November 2015 as I was suffering with horrific constipation. By December I thought I was dying. I started with panic attacks and shortness of breath, palpitations and so hot I thought I would explode. At the beginning of January I woke one night not able to breath and had a huge panic attack to which I called out an ambulance. I felt a fool as my oxygen levels and ECG showed ok and thought I had imagined it all. My GP ran routine bloods at that time which showed I had been taking too much levo and lowered my dose straight away. The panic attacks and shortness of breath have continued, although not as severe as previously. Also the constipation has now returned, and I have not slept in three weeks. I have been told it takes time for your levels to drop. These symptoms are really getting me down now and I don't know what to do for the best. I have never suffered a panic attack in my life previously so it clearly has been due to the med's but shortness of breath is very scary and has prompted me to visit the hospital and GP again. How long should I wait before going to my GP and telling her I am still getting symptoms. I am so desperate for some sleep, feeling quite scared with the shortness of breath and struggling with the new symptom of constipation. Should I ask to see a ENDO or will this settle, anyone had similar problems? Any advice would be gratefully received.