I can't imagine that you went hyper after only 2 weeks on levo, since it takes 4-6 weeks for it to even reach full potential.......
Hypoglycemia can cause fatigue, as can other conditions. Fibromyalgia is a set of symptoms with no explanation, as is Chronic Fatigue. Once a person is started on thyroid medication and dosage is adjusted adequately, symptoms typically go away.
IMO, you need to be retested with TSH and both, Free T3 and Free T4 before you make any adjustments to your medication, since it takes a while for the body to adjust to having hormones, it's been doing without.
It is more likely that your dose was too much, and you are over medicated. I would seek an Endocrinologist that will test your TSH, TFree, TPO Ab level, Hormones levels and do an Adrenal Stress Index. Finding a med that balances these levels can take more than one attempt. You need a Dr who will work you through the process and help you understand. (FYI - cotiosteroids effect the adrenal glands, so the Adrenal Stress Index might be helpful. It does not sound like you are dipping into and out of hypoglycemia, which would include symptoms like irritability, shakiness, and nervousness. Chronic Fatigue or Fibromyalgia can give you weak arms & legs, with sweat, but usually show up with a myriad of other problems.
Did your doctor do any thyroid tests, other than TSH? He should also have done Free T3 and Free T4, which are the actual thyroid hormones, while TSH is a pituitary hormone and should not be used alone to diagnose a thyroid condition. If he ran the actual thyroid hormone tests, please post the results, with reference ranges, which vary lab to lab and have to come from your own lab report.
Thyroid hormones are measured in mcg, rather than mg, so if understand correctly, you are on 50 mcg/day. Please verify that.
It takes 4-6 weeks for the levo to build to full potential in your blood, though some people report lessening of symptoms sooner. It's not unusual for symptoms to worsen after beginning thyroid replacement hormones, or for new symptoms to appear. Often it's a matter of waiting for the hormone levels to reach a point that's good for you. 50 mcg is often a "starter" dose and it's entirely possible that you will end up on a higher dosage.
P.S. Hypothyroidism runs in my family. My mom, my sister both have it.