Stomach Ailments - when to see a doctor

Hi all,

3 weeks ago I came down w/ severe watery diarrhea and cramping, nausea/vomiting, fever etc. etc. and was diagnosed w/ gastroenteritis a few days later (apparently a "bug" was going around at the time and the doctor thought I likely has caught this).  Apparently I also had blood in  my urine (not visible to the eye) but didnt have a UTI and this symptom was dismissed.

It took over a week for most of the symptoms to disappear but I had the watery diarrhea up until about 4 days ago (only in the morning and it was not acompained by cramps) and some foods make me feel a little nauseous (I am NOT pregnant!).  I have been feeling very tired by the afternoon to the point and have only been able to run 7-8 miles a week instead of my usual 30+!  I have now started experiencing severe bloating and gas after meals (I am not eating anything differently than what I did before I got sick).  Its at the point where I actually feel nauseous and have to stop dead in my tracks due to pain from it.

Just curious as to whether these are standard complaints after a bout with gastroenteritis - e.g the tiredness, bloating/gas or if this signals something else that I should visit a doctor for.  

Any input is appreciated.

thanks.