Hi, I work night shifts in a home for young people with learning difficulties. I'm on my own there at night. There is only one other night worker but there are people on the bank who could be asked to cover and of corse agency.
The other night I worked, I started to feel sick, this got worse as the night went on and at about 7:30am I was actually sick. I knew the morning staff would be in soon, so didn't phone the on call person.
When the team leader came in, I told him I'd been sick and feel awful and that I didn't feel well enough to come in again that night. He said to see how I go and phone if I'm sick again. I was sick on the way home, my Dh had to pull over, so I phoned work and told him. He said "So what do you want to do?" and I said well can you please try to cover my shift and if you can't, phone me to see if I'm any better.
At about 5pm, my boss phoned to say "You said you'd phone back but didn't!" I said that I'd told the team leader and she said that it must have been mis understood.
She said that the other night worker would cover my shift, but in return she wants me to do one of hers next week. 
I do 3 nights a week, which is hard enough as I have a DD with special needs who is home educated and needs a lot of care. I really can't do 4 nights in a week, and don't think it's fair that I should have to.
I told the boss in the nicest possible way that I wasn't happy with this and she just said "well, I'll leave it to you to sort out with the other night girl. 
I haven't had a day off sick in the 12 months I've worked there! This other one is sick quite a lot and because I can rarely cover, they get bank or agency. They don't make her do extra shifts!
I don't even mind if they don't pay me, there is just no way I can do 4 nights in a week.
I do like my job, it's the best one I've had. I'm very fond of the residents and the money is good so I really don't want to make things difficult for myself. At the same time though I don't want to be treated unfairly.