Companies do not give a fuck about you. Companies do not appreciate any sacrifice you make for them, so make none. Never do more but just what they pay you for. You owe them 40 hours and they only owe you a paycheck. You're employment is temporary. HR is there to protect the company from you. Save your money, Network and have a plan b.
You are selling your service to the company, so it's a win-win on both ends. You deliver a service and get paid for it. If you can't deliver, or they don't need your service, or can't pay for it, there is no win-win anymore.
I'm a freelancer, but even when I was employed I looked at it like this. It's the best way to neither live in fantasy land where "your" company is your family, nor have a negative view on companies.