What Causes Persistent Itching On The Neck, Under Arms And Under Breasts?

Since December in experiencing itchin neck, under arm under breast and also near eyebrows I taking antihistamine , I started complaining since 10/2015 after going camping with some strangers 1 week , and near a river in Sacramento ca, a day after felt tingly feeling movement as if I swallowed something, I told my roommate that if I had a critter bug or insect, even when I m restless it felt as having a foreign object, every six months or so after and so on I get worst, coincidently I had my tubes tied in 8/2016 and iv gained 85 pounds in less than 2 months, but the itching is uncontrollable when I worked seasonal this past May I was ashamed I could not control my hands and I tried to prevent aggravated scratching with the help of the antihistamine,