Idk who else to ask...

I know I'm probably psyching myself out... But I'm wondering if there is anything wrong with me... I have a blinding pain in my back straight behind my left breast. And I can't figure out of its just the back pain or not but it's making my boob hurt to... Like alot. Also there is this dime sized pink spot on my boob but that could also be cause I scratched it... It was terrible itchy last night. I'm wondering all those things cause I've been dieting for a month and have lost inches but not a single pound. What's wrong with me? Am I crazy for being scared?