Celery Juice or HMDS too sweet? - feeling of tightness

Been drinking CJ and HMDS for a couple weeks now. I noticed often times that after the HMDS smoothie (lots of fructose) I get this uncomfortable feeling of tightness in my upper back / heart area. It reminds me of the time when I drank too much coke in a short timespan.

I don't chug it down because I enjoy the taste of it. But I'm not slow with it aswell because if it stands too long, the consistency changes and it goes from creamy to some sort of lumpy / chunky. A l little longer and it becomes gelee-y. And when it gets there then can't enjoy it anymore and have to force it down. Had it just rest for maybe an hour the first time I made it and I literally had to get a spoon back then.

I'm drinking my CJ right now and can feel that tightness slowly creeping up on me aswell and I'm barely 300ml in. First time feeling this with CJ right now. But it has happened after drinking HMDS a couple times now.

Is it a detox symptom? Did AW say something about it? Does the body get used to it?
Also wondering why the consistency of the HMDS changing so quickly.