Hi,
Rubber band ligation of piles should not cause the symptoms you have described. In most cases, there may be some local discomfort or blood stained stools days after the ligation process.
The symptoms you have experienced are most likely unrelated to the procedure in my opinion. Having said that, people who have bled a lot before the ligation procedure may experience some of the symptoms you listed due to anaemia.
As such, I urge you to seek help from your doctor who did the procedure for you to find out if further tests are required. On your part, try hydrating yourself with plenty of fluids. Dehydration and transient low blood pressure may account for some of your discomfort. I hope you have a speedy recovery.
- Dr Quan