I've never felt like throwing up or passing out. I have felt 'weird' after a lot of sets of deadlifts though. I dont sweat a great deal, which I believe is down to some decent cardio conditioning, but my heart does race after each set. I used to have a real bug about not feeling knackered after my lifting but I got over it in the end. Its a redherring. I know I'm lifting hard if my form starts to falter and my performance begins to drop on each set, I know I'm pushing myself. I dont get any DOMS either. I got over it. Infact I'm glad I dont because my 2 weeks experience of doing 10x10 squats was terrible.
So long as you're making new personal bests I dont think anything else matters.
