Hi, I'm a 22F recently graduated with a BTech in Computer Science and soon started working for a service based IT company. 
For some background, I've always suffered from anxiety. I've seen multiple doctors and taken meds in the past. I'm seeing a therapist at the moment. But my anxiety has gotten so bad since i started work, nothing seems to be helping anymore. At work, I have a very hard time asking for help which slows down my work significantly. Sometimes I work till late night since I have to figure out everything out by myself as I can't ask for help. I stress out too much about all the meetings and calls I have to attend to the point I feel physically sick. I feel like I'm out of breathe and I have no appetite. 
I'm at a point where doing smallest thing has become a major task. I cannot quit the job since my parents do not understand what I'm going through. Sometimes I feel so unworthy and stupid, i feel like giving up. 
Also to add, this company does not have a very good work culture. There are very tight deadlines. I've also heard the manager yell at a coworker in a call. Although he didn't yell at me, I've been terrified of him since then. But I feel that I make up most of my problems in my head. Even though the workplace culture is not that great, i think this has more to do with my made up thoughts than anything else. So will it be wise to quit the job? 
Excuse my grammar, English is not my first language. Any advice is appreciated. Thanks.