My child is a hoarder, help!

My kid is 6.He attaches extreme emotional connection to, well, crap. Sometimes it’s a legitimate “important” thing like his medal for being a “Super Helper” or photographs or a toy that his grandma gave him...but it’s just as likely to be a toilet paper tube, a pen, a rock. He knows where he acquired each item, too, like “that sticker was on the shirt my aunt bought me,” or “that cardboard box grandma and I used when we played with the train set in March.”He loses his mind if I or anyone else touches his stuff. It’s causing conflict between him and everyone else (friends, cousins and other extended family). His possessiveness also extends to my stuff if he thinks someone shouldn’t be using it. (Example: I gave my sister some shampoo I didn’t like the scent of, he tried to take it from his aunt and was very belligerent and verbally aggressive before having a crying meltdown about it)I don’t know how to handle this or what to tell the extended family to do when he has a meltdown (like the shampoo incident).He snatches toys out of people’s hands (even adults) and tries to hide stuff in his room where no one can touch it.What do I do? I feel like there is probably a lot of other underlying issues that are contributing to his need to hoard, but they are all external and I can’t fix them: his deadbeat dad “abandoning” him, me breaking up with my long term boyfriend, starting school. (My kid also has extreme social anxiety—he was terrified to go to school because “everyone might laugh at me.” He also frets/obsesses over incidents that happened months ago, like if someone at daycare said something mean to him) via /r/Parenting https://ift.tt/2LWRVbu