Re: Itchy skin
When you have a baby, your hormones play up, and this can cause all sorts of sensitivities. (You can look forward to lots of this when you hit the menopause!)
First thing I'd do is to change your washing detergent and conditioner to non-bio 'Pure' types. The less crap that is in them, the better.
Then look at shower gels and bath oils and change those to something like Sanex Hypo-allergenic etc. Or just bathe in water, like I do.
I'd also ask my GP to run full blood tests to check for vitamin deficiencies (lack of VitB12 can cause this)
If all this fails, I would consider anxiety. How anxious are you at the moment? This is an anxiety symptom caused by hyperstimulation. I have fibromyalgia (which can cause this symptom) but I also have anxiety, so it could be either with me and I've had it a few times, only mine has always been in specific areas - so chest, or my thigh, or my foot. However, this anxiety symptom can affect the whole body at the same time.
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A thought is harmless unless we believe it.