I had problems with my gallbladder and had it removed before VSG. After the gallbladder surgery I still had issues with going to the bathroom, however, since I have had the VSG I haven't had any issue with dumping.
I do try to get other protein, however that is crazy that it is still on the market and advertising the claims for which it has been sued. You can't trust anything and that is sad. There should be stricter testing on these protein supplements.
I had the same problem. The only way I could drink and can still drink the protein shake is to mix it with decaf coffee. Another alternative my doctor suggested was unflavored protein - by Genepro 30g per scoop- it truly is flavorless and can be mixed in liquids even soups and can even be added in things like scrambled eggs to increase the protein.
I had to use vitamin patches because the chewable made me throw up and I still can't swallow a vitamin because I need a lot of water to get a pill down. I still use them and I am 4 months out. You can get them here through bariatric pal.