Sorry for the TMI. I've also name changed as I don't really want this linked to my usual name.
Since yesterday afternoon I have been having horrendous abdominal cramps, the kind you get when you've got the runs but nothing was happening, just cramps. I felt really exhausted too so went to bed early but was awake most of the night running back and forth to the loo! 
This morning I felt a bit better so thought perhaps it was just my IBS playing up although I haven't had a flare up in a long time.
But by midday I had a temperature and the chills and felt exhausted and everything I drank/ ate went straight through me so I took myself off to bed thinking I must have a tummy bug or food poisoning.
Sleeping is really difficult as my body aches and every sip to drink causes cramping in my abdomen/gut.
I've now noticed I've started bleeding from my back passage too. 
I have terrible health anxiety at the minute as a family member has had a horrific time with IBD and has had major surgery recently.
I'm sure it's just a stomach upset and I'm being overly anxious because of my anxiety but I needed to ask to put my mind at ease. I'm afraid to ring the doctor and potentially waste their time as it's probably a simple stomach bug.
I will be isolating now because of the temperature though. Thanks in advance.