I've heard this and it's hurtful. It's demoralizing and it's not right! IT'S NOT ALL IN MY HEAD! It's in my body, it's in my joints, it's everywhere...and it hurts.
When we hear dismissive things like this it can make us question our sanity. It can make us wonder and think things we shouldn't be thinking. We can also then take our pain and turn inward with it...and we can start to hurt ourselves... isolating ourselves...and more.
It's not all in your head! I know you've heard it too...but... please don't believe it. It's not all in your head.