ShouI go back into work or stay off for the rest of the week?

Ok…
Thursday night/early hours of Friday morning vomited several times and had very bad stomach cramps, which I thought could have been a bit of an allergic reation to some chinese I had eaten or possibly it was a bit dodgy, so I went to work the following day, I still had stomach cramps but not as severe and felt a little better in the afternoon, however by the time I got home I was VERY tired so went to bed.
SATURDAY – I felt fine all day, went to a bonfire display everything ok until 12pm that night when the stomach cramps started again through out the night I vomited had worsening stomach cramps and basically got no sleep, so around 630am the pain was unbearable so I went to the emergency doctor my cramps seemed to be getting more painful, they were so bad they suspected either appendicitis or gastroenteritis, I was sent to A and E where the pains intensified to a major extreme, I was put on a drip and had a dose of morphine as the pain was unbearable (worse then childbirth!) I was transported by ambulance to another hospital (no blue light, but they wouldn’t let my hubby take me!) There I saw a consultant who ruled out appendicitis and told me that he suspected I had a bad case of gastroenteritis. He recommended that I had a few more days off work. So I took the Monday off work but went back yesterday still feeling rough but managed to get through the day and parents evening. Last night I had ‘unpleasant toilets’ but went into work feeling obliged to do so (dammed if you do and dammed if you don’t scenario) but felt very sick and dry vomited, so came home. I’m now at home and just have that ‘I don’t feel quite right’ feeling I haven’t been sick again and I don’t feel unable to work but my stomach feels really wierd and just not right…
So do I go into work tommorow and tough it out? Do I take the rest of the week off? Or just tommorow?
HELP! I feel obliged to go into work, I don’t do ill and hate taking time off, I’ve never had to do it since I started teaching in 2005. This a new job and I have already had 1 day off when I sprained my ankle and obviously the Moday of this week off.
Sorry for the long details but felt you needed the whole story!
Thanks guys xx