25F I want to better but I don’t know how

At a loss of what to do. Hi everyone sorry if this post comes off as rambly but I am struggling and I need to vent and I hoping that anyone who has had similar experiences can give me advice. So essentially ,I think my meds have stopped working, since December of last year I’ve been taking 30mg of Prozac which has been working great for a couple of months, but lately my depression/anxiety has been hitting me with full force. It was especially agonizing this past weekend i couldn’t leave the apartment without feeling like I was going to panic. Even walking outside just to take out the trash made me feel like my heart was going to explode and I don’t know why! I couldn’t even relax while inside my apartment I spent most of my weekend paralyzed to my couch constantly repeating the same thoughts over and over. And I am left feeling with a deep sense of exhaustion even tho I literally did nothing all day. I am seeing a psychiatrist and therapist, and they have upped my dosage to 40mg Prozac but I am still am not feeling any positive effects, and to be frank I can’t help but feel hopeless. Is this something that I am going to have to deal with forever? I just feel so frustrated that I can’t have a normal brain. I’ve been reading that exercise can help but Everytime I try and go for a simple walk out outside I still feel so much dread and feel overwhelmed. Is there anyway I can get past this? Genuinely I want to change and be better, but I feel stuck. I wish there was a step by step guide that I could easily follow.