The important thing for you isn’t school right now, and doing better in school, or even getting into PA school, isn’t going to solve your problem. But your problem needs to be addressed properly. If you tackle your emotional struggles, you will be equipped well for success, and to be able to clearly see your options. You need to be seen professionally by a therapist and probably a psychiatrist or psyche NP. After that, you will be headed the right direction. Doing that might be one of the most important things you can do in your life from here going forward. Please consider that.
So you are in a bit of a rut with school, and from here, any further setbacks will weigh down your emotional state and make it harder to succeed because you will feel more desperate each time you face a setback. Take some time to reset and look at your options. You really cant succeed at tough school courses when someone is standing pointing a gun at you... it’s just not possible. You need to be able to sit down in a relaxed state with your chemistry book and digest the material.
So that said, your other prereq grades being As or Bs is a good sign. Your GPA is in the tank a bit. But also consider another path in case PA school proves to be too picky (they like folks with GPAs around 3.5 or better, and only rarely compromise). They throw a lot of information at their students really quickly, and each seat needs to be filled by someone ready for rapid fire learning and focus. It’s not much more complicated than that, they just can’t hold anyone’s hand because they get one year of in class schooling.
If things don’t pan out for you as far as Pa school, you have options. Your prereq grades might get you into nursing school. You could graduate with your biology degree and get into an accelerated bachelors in nursing. From there, you could go to NP school.
Just don’t fret, because that leads to more fretting, and more frustration. But you need to master your own mental state before you are ready to take on any more challenges. From there, things will improve considerably.