Hi I have had diarrhoea, lower back ache and fatigue for 5 weeks.

Too long to wait. Be examined ASAP! I hope you've managed to stay well-hydrated during this time, but you must be seen and treated for whatever the cause is. It is really important. Don't wait another day. I hope you are better soon. Best!
GI consultation. I suggest a GI consultation, blood and stool analysis - 5 weeks is too long for sustained diarrhea.

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