What is your body temp and what exactly are your symptoms? Nutritional deficiencies, toxicity, diabetes and other endocrine system problems can look like hypothyroid disease, or cause hypothyroidism.
Hypothyroid disease can often be difficult to diagnose. If you read through the posts here, you'll find the majority fall into two categories: 1) questions about getting a diagnoses, 2) questions about medications.
Hyoothyroid disease can go undiagnosed for decades.
I live in California and I'm finding thyroid disease is epidemic, though still extremely difficult to get treatment. My own experience includes decades of undiagnosed thyroid disease, another five years messing around with meds, years of research and trial and error with alternative and natural treatments. So I've read a lot. Most of the supplements marketed for thyroid disease will not help.
Iodine and kelp deficiencies are traditionally believed to be the problem, so here in the US, they've added iodized salt to everything. But the thyroid disease epidemic indicates this did not solve the problem.
I'm in California and we have issues with radiation exposure from nuclear power plant problems, as it is common practice here not to notify the public when a power plant overloads and releases radioactive iodine into the environment. This contributes greatly to the thyroid disease epidemic. And in fact over the last few years, many famous actors and models in Hollywood have come forward with their thyroid disease struggles.
While there is a lot of misinformation, there is a lot of help. It's a matter of sorting through everything and having a sense of what works for you.
Thyroid patients often keep journals on their symptoms so they can track what works and what doesn't. For most people this is difficult because a common symptom in thyroid disease is brain fog, plus most people don't have the analytical skills to troubleshoot their own symptoms.
Do read through the many posts here on thyroid disease, as there are many on how to Manage thyroid disease, what sorts of tests to have done, how to understand your test results, etc.
Meanwhile, if you feel strongly that you have hypothyroid disease, start by improving your diet, take good quality multiviatamin and mineral supplements, change to a gluten-free-paleo style diet: you'll have to research these. Both Hashimoto's and Graves' disease are autoimmune at the source, so the diet is helpful incalming the immune system. Eat plenty of good quality, lean animal protein, as protein dificiency can also contribute or exacerbate thyroid disease. I've found I get more relief from amino acid supplements than anything else I've tried. I feel the medications made my thyroid symptoms worse, and caused additional autoimmune disease.
Next time you go in for an annual physical, ask for a full thyroid panel, not just TSH. An ultrasound can show cysts or other growths, which would render a diagnosis. Antibody tests of various sorts can be used as a diagnostic tool if positive, but mean nothing if negative since they have a 50% false negative rate.
Hope that gives you some direction.