"It's tough going" means "it's difficult" or "there are a lot of problems".
Here are some situations that can be described as "tough going":
- A sports team's losing season:
It's been tough going for the Lakers this season.
- A country's bad economy
It's tough going for millions of unemployed Brits right now.
Emergency workers' effort to help people after a large natural disaster
Rescuers are desperately searching for survivors, but so far it's been tough going.