"It wasn't even due this week. I was the one who initially said I could have it done by Friday. My boss didn't set a deadline for me. He was just pushing me to get it done. "

part of the issue here is the part that YOU set the deadline, not the boss. you added on to the stress level. I think that it is on you to learn to better assess the needs of the company and the amount of time work goals take. it's nice to say things can get done early. everyone wants to impress the boss but not if you set unrealistic goals. that's extra stress you dumped on yourself. yes, boss wants project done. that is his role. telling you to get it done is his role and yours. you told him Friday and so then you had pushed yourself into a space that was difficult.