I haven't had any issues with dumping but I have experienced the sliming when I've eaten a bite too much or maybe not chewed well enough....It's disgusting. I try to go really slow and chew chew chew...but there are times I just forget what I'm doing and then get that horrible reminder.
I started out drinking the premier shakes and I had the same problems. I switched to Syntrax Nectar - it mixes with water - or whatever liquid you want I use water- and I like the flavors I get them really cold before I drink them - but it stopped making my stomach sick and helps me get my water in while I'm getting my protein in. It's a win-win for me.
You only lost two pounds in a week but if you lose two pounds every week that is 8-10 pounds a month. Exactly how fast do you want it to come off? It will come off. Drink your 64+ water each day - hit your protein mark each day - supplement the solid food with protein drinks if you need to - and exercise in some form 2-3 times a week. And stop saying "only" as in "I only lost 2 pounds this week" celebrate those 2 pounds!!! Because the weight didn't get put on over night so it will take work on your part to get it off and time. Good luck to you.