Is this hypoglycemia or just tiredness?!

Well, recently, over the past few days, I've been feeling a bit shakey - not to the point where it's dizzy, but still a bit. I feel pretty weak and out of energy. I drank some lemonade, and that made me feel a bit better actually. There is NO-ONE in my family history who has/had diabetes. I haven't encountered this feeling before I don't think — and if I did it must've been ages ago. And I took an MRI about 3 weeks ago and nothing was wrong.
I haven't slept too well over the past few days — I keep waking up early and then sleeping for a bit, but still feeling tired.
Oh, I had a cold last week and it went, but then a few days later it either returned or I got a new one. Could I be feeling weak because of this? Much appreciated everyone!