I had lots of lows and it seemed like I could eat and eat and it had no effect on my lows sometimes, especially in the mornings when I had lots. That started to reduce around 18 weeks or so, and the number of lows went right down by something like 26 weeks. Then I had what I call 'normal' lows - more to do with miscalculating carbs, etc.
It's normal to have lots of lows in the first half of pregnancy, but do speak to your team if they're really difficult for you.
As for the crying - hormonal again, I think. I cried at the drop of a hat during pregnancy. Be kind to yourself and take care. XX