I'm afraid that my therapy won't actually really help me. It makes me better at times, but I doubt anything is going to work long time and I really don't know what to do. How should I deal with this?

It will help you in different degrees and frequencies, each day can contribute something and health has many causes, many edges that can be polished little by little, sometimes a session will make you angry or feel that you are starting to float with a feeling of greater lightness. Building a wall requires bricks, building useful inner states requires continuing to advance despite setbacks because life contains adversity and challenges to live something better every week and year. Therapy could be also a tema, becoming an accomplice of their psychotherapist for a positive outcome, two people teaming up sounds great to a better day by day. May the Curiosty to be with you :)