Hi there,
I also have Fibro & other health problems that cause pain and exhaustion. I had my band done about 2 1/2 years ago.
I have the same problem, so I started keeping a diary. I realized I had to wait longer between taking my pills and eating. I will admit it still happens for no apparent reason. My PCP thinks it may be the Fibro.
This may sound silly since you sound like you are eating a lot of liquids, but is it possible you need slow down? I have found that to help the most, followed by eating foods that force me to chew a lot. BTW Greek yogurt (15gm of protein) seems to thin out a bit if it sits on the counter a bit.
If you are like me the meds create all kinds of problems. I'm on morphine & zanaflex so constipation is an issue. I found that taking magnesium supplements, stool softner & fiber gummies every day helps.
Let me know if that helps.