Might be nerves. What medications are you taking? Are you drink enough water. You intake will kill you if you do not do what you should be doing.
Wow, sounds like a case of some sort of skin mites. Please take yourself and your children to the doctor as soon as possible. Blessings - Blu
White eggs attached to hair are called "nits".
But as you and your children are all itching and scratching it is likely to be scabies.
You will need to get a solution to treat this from either your doctor or from the pharmacist.
You will also need to vacuum your house, dust everywhere and wash all clothes and bed linen on the hottest wash you can.