When I just moved my 2 mares from boarding facility to my place they were like that too: crazy! My mom was afraid to feed them. I simply took a stick with me and 1) they MUST back off and wait for me to walk in, and then 2) they did NOT get a bucket until they stand quietly behind me waiting till the bucket goes on fence. About 2 weeks was enough for them to learn that feed is coming and that I don't tolerate cr*p.
BTW, when my qh tried to chase the paint off her bucket (because qh eats very fast, while paint always been a slow eater), my mom simply smacked her butt with the manure fork handler. Hard. Once was enough for qh to learn the lesson: now she just stands by the hay waiting for the paint to leave the bucket (so she can walk there and leak on it).
"Life isn't about waiting for the storm to pass: it's about learning to dance in the rain..."
"When we are no longer able to change a situation - we are challenged to change ourselves."
"How people treat you is their karma; how you react is yours."