Frequent low sugar. To solve this issue?

I am on hypothyroid medication of 75mcg since 1.5 year. But I have been facing low sugar issues since 8-10 years. I take heavy breakfast in the morning and that too healthy. But still, within 2-3 hours, I get extremely weak, with shakiness, headache, dizziness and extreme hunger , confusion and palpitations. I would then  have to pop a chocolate to feel somewhat better. I have got my hba1c checked several times and the one checked in April was 5.4% which is completely normal. What should I do to solve this issue? Because now it's even happening in the evening at times. It's hampering my work schedule and I am also gaining some weight because during such episodes I take juicy or sugary foods to get immediate relief. Currently I am only taking thyroid medicine