Thyroid hormones are crucial just to stay alive, as they control metabolism, heart rate, body temperature, along with others.
You really need to get some current blood work and find out what your levels are.
The minimum tests you need are TSH, Free T3 and Free T4; these will tell you whether or not you need a higher/lower dose of levo.
Get the blood tests done and make sure you get a copy of your lab report, then post your levels, with reference ranges from your report, here, so we can help assess your situation and comment more fully.
You have been taking levo for a long time, and I'm wondering how often your blood tests are done or your levels adjusted. I wouldn't have been brave enough to stop meds completely without a latest bloodtest to 'gauge' where I was, to take to get another opinion. Did you get a copy of your latest blood tests? I hope you find a good Endo who can assess you properly.