I definitely can relate! I just recently graduated in May and throughout my four years I had many emotional and draining days/weeks like this. Just know that things do get better!! The absolute best way I made new friends as an upper classmen was to network with other students I sat with in class. It started small with things like asking if they did the homework and if they knew what the next assignment was. And eventually, I started sitting next to them in class more often and would ask to study together. I'm also not sure if you're the partying type on the weekends but just taking time for myself on the weekends really helped relieve some stress (grind out the homework due monday on thursday/friday). I hope maybe some of this helped!!!