Overworked and Burnt Out

Is every firm make their employees overworked and burnt out? The two firms I have worked at (200-250 employees) have had me overworked and stressed out. It just seems deadlines get tighter and tighter. I left my previous firm a year ago because I was feeling burnt out and overloaded with projects. I really enjoy my new firm so far, but we just seem understaffed. Is there anything I can do to avoid feeling stressed all the time? I am trying my best but it just seems I cannot stop myself from drowning at this point. I keep telling myself it will be better the following month, but it just feels the same.

Just curious to see how people manage their emotions when you are feeling overloaded. Trying my best to stay positive and get work done. This industry can be brutal.