Please help me ! exam Stress?

This week i started to do my exams and i had 4 exams in 4 days which caused me lots of stress there for stomach acid, sore neck, sickness, no appetite and nausea, i have taken some nerve calmer and some powder for my stomach acid, but i still don't feel well. i feel fullness, but i haven't eat that much and something in my throat. Please if you got any suggestions that can help me please do tell !