I don't know why I'm feeling like this

So for a while now I've been feeling like I'm starting to hate it when people touch me even when my friends or family try to hug me I end up backing away and tell them I don't like hugs but they still hug me now I've never really had a problem with people touching me before ,now it's like when someone touches me I start to feel sick to my stomach my friends and family say I shouldn't be acting like this they say it werid and that I should stop being a drama queen can some please tell me why I'm starting to feel like this please