Thanks for your reply.
I didn't end up mentioning this to the doctor when I went the following day as I felt kind of silly about it (I was going for medication reviews, etc), and in the morning before I went I was fine and back to normal. I woke up during the night dripping wet and had a temperature and the awful back/leg pains still, but by morning all was ok. I did sleep in though, and did not eat breakfast before I went to doctor.....and when I got home and ate some toast, it all started!
I have had constant diarrhea for 3 days now - averaging between 10 and 12 bouts in a day and it is basically orange water (like a high pressure hose, sorry for disgusting image, but it is pretty 'forceful' and not sure if that may be relevant). If I eat something, I get the diarrhea within an hour. Today (day 3 of diarrea) I thought I was ok - I even got some toast in and kept it in for about 3 hours - and then it started again and in the 10hours since the first bout today I have had 9!!! My parents told me to make a doc appt today but didn't end up doing it because I was fine till mid-afternoon. The strange stomach pain is there too, on and off - and not necessarily before a bout of diarrea, often afterwards. It is not a sharp pain though.
Apart from not being able to leave the house, and not eating much, I feel ok - not too lethargic or anything at the moment. But 3 days of this is getting a bit much - and I have lost 3kg (not that that's a problem, because I need to lose a lot more than that, but its probably all fluids).
The only thing I think it may possibly be from is Metformin tablets I am taking....but I have taken them for quite some time with no reaction for months, and never ever this severe even when I first started them...and I am only taking 1 extended release rather than 3 that I have tolerated fine in the past...plus the temperature and the pain could mean its something else.
Sorry this is so disgusting, but its almost Christmas and I doubt I will get in to a doctor at this rate! Other than keeping fluids up (and trying Immodium/Gastro-stop tablets - which are not really helping btw), what else can anyone suggest (including doctor)? Thanks.