Life goes through ups and downs. Personally in the past year I've had 3 friends die, one friends father died, another friend had an aneurysm [survived thankfully] an uncle died, and my boyfriend lost his job. It's sad but it's life. You go years with good things happening [last person I knew who died was 10 years ago] but people prefer to focus on the bad because they fear it.
Anyway, if you're concerned, cleanse/protect yourself and your home and do daily grounding and shielding. Regarding a curse, try and put it out of your mind. Most curses are self inflicted so if you continue to worry at every bump in the road you will curse yourself. Best to shrug it off. [Of course regular cleansings and protection spells are wise just in case, but don't fear someone's cursing you]