Are you talking about the final boss in Athiss that put a crushing affliction on random party members? If so that encounter is pretty hard to heal through for force healers.
At 22, you don't have purge so you can't cleanse it off. I recommend shielding party members who got it (you will know cuz that person will take a huge dip in health, the boss iteself doesn't hit hard at all) and be very conservative with your force. if you run out, you can do consumption (or whatever the republic version is called) to very low health and then use a medpack to give you back "free" health.
Check out my guide here, it has a video of the fight.