I am currently battling ich also, I know how you feel.
There are two ways that people treat for ich, dosing copper, or using the hypo salinity method. For the copper method, you will need a copper test kit, and be careful not to overdose. I hear the best way is to use the hypo method. In order to execute the hypo method, you will need to lower the salinity slightly over a set period of time.
Best of luck to you!