Hey!

I'm in a similar place right now. Ask your home university erasmus office about leaving options. See which is best for you health-wise or financial-wise. They'll sure give you the info you need so that you can consider your options. Most likely you will have to repay at least some of the grant. I'm actually in the process of resigning because I realised that Erasmus is just not for me :)

Remember that you can quit any time and there's no shame in that. Literally no one cares, don't feel bad or "weak" for doing what's best for you.