Earlier quoted context omitted.
You should talk to a school counsellor about the load. What is the worst that can happen if you don't graduate on time? I'm asking because i don't actually know... Talk to a doctor about the other problems you're having - if it's stress related you'll at least have some evidence to back you up if you discuss workload with your school.
But you don't understand: that's what everyone else in the program is doing too.
Take an honest appraisal of what you think you can do and talk it over with both your major counselor and a school nurse. If your body or mental health can't handle it, take it down a notch and consider dropping a course and retaking it the next semester/quarter.
Half of the controversy of the suicides based on parental+peer pressure and competition is that the demands will never plateau or fall. They will continue to rise above the abilities of more than 99% of the people who enter the competition. There is no supply/demand curve where parents/peers and you will magically find an equilibrium. Learn to have your own expectations, independent of your parents and peers.