Well you need to get this sorted out ASAP. Is your OPM for your group approachable? If not, you can always speak to one of the others.
You also need to speak to your union rep, you have MW and LE as reps who will be assisting you in the event of a disciplinary, so it might be worth having a chat with them next time they are in.
You say you are flying whilst sick now - is the sickness a cold or something more than that? Have you been to see your doctor? If your doctor signs you off for being sick then the company can not touch you. Also if your doctor signs you off as sick, the company doctor can not over rule this (and the OPM's can not question the sick note as they have no medical training whatsoever other than that what we as crew have).
Sickness is the one thing that I think easyJet handles appaulingly, it is about time that Andy Harrison looked into the way that crew are treated when ill and relax the sickness regulations to a humane level!