Awww 4 days post hey, hope you are doing ok.
Diarrhoea is quite a common symptoms following surgery, as your digestive tract has been upset during your procedure and also that you are on liquids only so this doesn’t help. This will improve over time, just make sure you are drinking plenty of clear fluids also, sipping slow and continuous throughout the day. If it was down to dumping likeliness you would be having other symptoms alongside the diarrhoea – are you experiencing anything like, cramps, sweating, pain, nausea, flushing, dizziness, heart palpitations ??
Maybe if you are using milk based shakes, try soups instead, incase this is making things worse
Do you have an appt planned with your dietitian?? xx