How to deal with stress that paralyzes you

I'm so academically stressed, pressured right now that it paralyzes me and I can't do anything. How do I relieve this? Everything's so heavy and I constantly feel horrible. I've gotten sick and fatigued a lot too but I can't just keep taking breaks because that'll destroy me. I'm getting left behind and I don't even know If I'll get my desired average now. It's like I'm throwing everything in the drain.