As a general rule, persons do not curse randomly. So that means that the source of this issue must be someone you know and they somehow felt that this was the way to go, perhaps due to an insult or something from you? As for being involved, if it is the case that you are genuinely cursed, it is likely that you knew the person who did this, had some form of connection, and did not sever that bond.
As far as treatment, generally, cleansing self/mind and power cutting can be good. But it will depend on the methodology that the person used to curse you. Do you have any confirmed methods that were used to curse you? (also how did you get these confirmations?) Curses usually have expiration dates, so if you are still experiencing bad things occurring, take a look at all actions you are taking and the people that you still hold connections to, including your own self. Do you think you deserve the bad? It might be as simple as walking away and taking a hyssop bath.
But really, we can't help you as a forum without more detail than offered. The likeliness that it is an actual perpetual curse is lacking though. Bad luck happens, but take a look at what else is going on in your life. At the end of the day, you are in control of not only your body, but your mind and reactions. It is this self actualization that will help you defeat any bad luck you are experiencing. What have you done to attempt to rid yourself of this? Start there. Meditate, cleanse, ground, wear protective herbs, ask your spirits or daemons for help. These are all generally effective band-aids for this until you figure out how you were involved in the start of this issue and can cut the cord more permanently.
But be aware of the victim mindset. Most magicians worth their salt take control of their lives and take action. Things do not "just happen" to people continually without inviting it in or not taking the appropriate actions to mitigate the circumstances. Do bad things happen to good people? Sure. But If you are in fact cursed, then only you are able to take back control of your life and get rid of the curse. This means you need to do the work. You are not an innocent bystander in your own life.