going on 3 weeks now i can t seem to get rid of the itch in my legs, arms, feet and neck. my 5 year old son is suffering the same way. our docs have told us that it could be insect bites, bed bugs or anything similar. we got rid of our old mattresses, sprayed and cleaned our house, had our backyard treated...and nothing. we re still very itcy and it won t seem to go away. tried prescription meds, creams and otc stuff and nothing is helping. do i go back to my doc and ask for a blood test? i m worried about my son. he s really all bruised up from all this. please advise.