Huel actually has a load of pre and pro biotics which can disrupt (make better!) your general stomach fauna.
You mentioned that your digestion wasn’t wonderful to begin with so, purely my uneducated opinion here, I wouldn’t be surprised if it was that which was causing you discomfort.
You also mentioned weight loss, which Huel can be brilliant for because it’s such an easy (and for me lazy lol) way to track calories. It can be done, very easily.
Loads of resources on this very website to help with using Huel for weight loss, I hope you don’t mind but I’ve recategorised your query from experiences to weight loss as I think you’ll get more traction and advice there.
Also take a look at this article by the team. I think there are more recent writings too, someone who keeps up better with the weight loss stuff will probably be along and link you:
Can it work? Yes of course it’s all a matter of Calories in being fewer than calories out. Exercise helps but really doesn’t make a vast amount of difference for general weight loss no matter what you see on television.
I know this because I lost over three stone in weight and I’ve kept it off. Huel is t some random diet product like slim fast shakes or whatever, it’s part of a lifestyle choice. I’m 45 and I have chosen Huel as simply being a part of my life now, I look forward to it and (this is gonna sound properly bad fanboy) sometimes when I’m intending to have a particular meal I end up having Huel hot&savoury because it is simply tastier than whatever I’d planned lol.
Best of luck with your plans, really want you to succeed so if you have any questions or just need someone to shout at you and tell you to get a wiggle on then we are here for you.