I believe people can direct their energy in a negative way. Whether that be through spells, thought manifesting, or direct energy projection. Or some other means I haven't thought of.
So, yes I do believe you can be cursed.
There is a gemstone, Fire Agate that is a very strong shield, but it not only shields, it also directs any negative energy back to whomever it came from.
You can also put energy shields around yourself and your home. I have a friends that was having a lot of problems with negative energy, has for many years. She started working with gemstones and putting very strong wards around her home, and things are sooooo much better for her.