Nausea after 2 years... (specifically diary/drink related)

So I'm 2 years out from gastric sleeve surgery. Last year I started eating carbs again and got way off track. I posted about this back at the end of December and I'm still trying to work the kinks out, since I have been on-and-off doing well with getting back into the healthy lifestyle that I LIVED BY before reintroducing carbs. I know that I can do it I've just been having trouble keeping myself from falling back into old habits.

I've recently noticed that I almost always get sick when I drink/eat anything dairy-based AND sweetened. Whether the sweetener is artificial (no sugar added hot chocolate or protein shakes) or real (like one serving of ice cream on a cheat day). I get the sweats, that feeling of shakiness or general unease, and finally unignorable nausea until I just have to just run to the bathroom and give up.

This is not something I've ALWAYS suffered from. Especially with the protein shakes since I drank them regularly for at least the first six moths or so. I think this happens more often with powdered protein mixes than it does with the pre-made premier protein shakes though, for whatever that's worth. I keep telling myself it may because I just drink it too fast, but I am not so sure anymore.

I have almost a full case of premiere protein (which I think I'll TRY keep and just drink verrrry slowly) and a brand new container of EAS Lean 15 protein powder. Not sure I'll ever be able to finish that if every time I make a shake I get sick.

At this point, I'm just ready to give up on protein supplements period. I am trying to maintain a high fat/protein and low carb diet (basically keto, but modified for WLS and my protein requirements) so I definitely feel like I get enough protein anyway without the supplements. I don't know.

I'm really just writing this because I'm curious if anyone else has experienced the same thing.