Ive been having weird dreams lately?

Having a relative as a best friend can cause mental and emotional bonds that are very strong. When they pass away, you cope with them being gone by having your sub-conscience create dreams with their image or remembrance. Sometimes there are dreams that relate to your loss like the "nightmares" you've experienced. You lost someone close to you so you worry about other people close to you dieing. I've had similar experiences after the death of my uncle.