[mothered]

And I may have lost a lot of weight (like 20 pounds) that I needed, since I was already underweight...  

You mean you were already overweight.

PS: Anyone know why I'm shaking and breathing weird?

What you've described Is consistent with anxiety.

I'm not suggesting you have It, but those with anxiety-related disorders are characterized with such symptoms.
It's great to have you back. Please take care.