Everything is normal, don't freak out take a breath and be logical. Otherwise you'll just work yourself up and the kid can tell and match. Not a great place to be in.
Read to them, sing with them, point and explain, freely offer info. If you treat them like they're a bit older and can absorb things, it's actually surprising how much will rub off.
MOST importantly, Take care of yourself. Seriously, It's the whole "put the mask on yourself before helping others" idea. If you're tired, frazzled, and health is declining, you can't provide the support and clear, frustration free thinking you need as a parent.