By continuing to fly, you are risking serious and irreversible injury to yourself and amongst other things, your hearing. Any kind of decompression might lead to serious and lasting damage.
The company sickness policy will eventually pull you up and terminate your career in the air. Colds are unavoidable, and your sickness record will gradually deteriorate over time (as may your hearing).
You should take immediate steps to change your career.
I'm sorry that this may not be what you want to read: Genuinely sorry. It is, however, good advice.
Good Luck!