Well, if this latest small meal comes back up, just think about him like he's a human that's had the stomach flu, & needs a soft diet for a while until their stomach is ready to digest solid food- don't panic & think it's something awful like "crypto". I think it's much more likely to be from the Fortaz.
Also, IF he cannot digest solid food yet, work on him keeping a liquid diet down- the hookworms can wait a while, until his body is in better shape. Dosing a snake with multiple meds is often poorly tolerated- just an observation of mine from this & other forums.