Yay glad he seems better
We had exactly the same problem, LO was sick after and during feeds, sometimes projectiles. But we also had constiptation to deal with too.
HV was next to useless Dr didn't want to know.
We tried Cow and Gate premium and the first few feeds were great then it started happening again but because of the prebiotics that weren't in SMA his poo's were great now.
So we changed to Cow & Gate Comfort and he's still sick but not as much.
Now the bibs get soaked with drool lol.
And the clear stuff after a feed is perfectly normal, baby's body takes all the nutrients and spits the clear stuff out as leftovers not needed,
It may be worth changing teats too, we were on Tommee Tippee size 1 (slow flow) but changed to Size 2 (medium flow) at the time we changed to Comfort. The comfort milk is a lot thicker than the premium milk and bubs may struggle and get tired trying to suck from a smaller teat.
Sorry I'm waffling lol.
Cx