Hi there.
I like to train and used to take protein shakes between meals. I took whey for years and everything was cool, but then things changed, first it was stool size/shape (rabbit droppings) then I flared. I changed to whey isolate and things went back to normal for about a year then the same thing, rabbit droppings followed by a flare.
I knew it was these products as i didnt take them when i went offshore to the oil platfrom, and by the end of my trip things were improving or had stopped.
I noticed mentioned the other day a product called sunwarrior protein, I will take a chance and try that, maybe thats worth a shot for you also,
I also stopped taking creatine in the summer as it also started to give me problems, darned to hell I liked that product!
So either something is changing with the product manufacturing/quality or/and it is me changing as I am getting older.
Any of the products I have tried over the years that had sweetners, colourings, flavourings added would not sit well with me.
I unfortuantely tried Gaspari super pump some years ago, jeez, that should be renamed Gaspri super dump, only took one shake and noticed my lips were burning, then about 10 minutes later my other lips were on fire too!