What Causes Legs Itching, Aches And Bruises With Sensitivity And Breathlessness?

I gave birth to my son four months ago, and ever since I have noticed a weird symptom. Whenever my upper leg itches and I lightly scratch, I get a deep ache that seems to radiate to the bone. It is bad enough to take my breath away. Now I am not scratching my legs any differently than before. My legs just seem extremely sensitive. Also, my legs are covered in bruises and a lot of times I have no idea where they came from. What could be causing this?