I did read your first post but was not able to, I wish I did so I could understand more situation of yours.
You are going through transformation. It is scary, confusing and makes you sad. Your plans are not going according to you have planned. I cannot say it will be resolved within a day, week, or month. It really depends on you and your heart and brain. All I can say it does take time. I did started medication and not one bit it helped me. I realized that I need to take care of myself.
When I was on low phase of my life. No one was there. My family did not understood what was happening to me, my friends were having their own problems. I was left alone, searching for answers, finding relief. My therapist were not able to help much. I am saying is release everything. Let healing take its own time. But please do not blame yourself, do your fault yourself. You are responsible for your own happiness and now how other sees you. You are an amazing individual who has so much to offer. Do not think college is everything because it is not.
As far your exam goes, start eating healthier food that are good for your brain. Focus on your Gut system because that is more important and more powerful to your brain. Reduce sugar intake completely. Drink more water, low sugar fruits. If you are concerned about your exam, completely avoid processed food including high carbs. I will post a video about GUT system.
I remember when I had stomach pain, my entire body was failing, our energy comes from strong immune system.
For now, take a deep breathe, smile and start doing things that will make you happy and alive. spend more time in the nature and spend more time accepting yourself.