From April to April I've had about 5 days off sick with flu, abcess in my mouth etc, but I've also been under a lot of stress at work, just been through a disciplinary. I've now had new stuff happen - some people at work have been talking behind my back and now I've got to have another investigation. I'm feeling very stressed and my gp has suggested that I get signed off work but I don't want to get sacked for it. They can't sack me for going off sick can they?