For the past week have had severe itching on upper back; not localized. There is no rash, bumps, or hives. Have used hydrocortisone cream, cream for poison ivy and taken benadryl (which does help some). Have check continually for any body lice on back or interior of clothing but there is none. Have also had burning/itching eyes some days and a slightly flushed look to my upper chest (though no itching there). I do not appear to have a sunburn. Could this possibly be just an allergy? How long should I wait it out before getting medical help?