Anyone on here dealing with PTSD AND GAD? If so, how do you deal with it?

Hi everyone. So a couple of months ago, I was diagnosed with PTSD, minor depression and GAD. I am a 21 year old female. I took meds and stopped once I found exercise. Not only does it destress me after a hectic day, I am working on my physique in the process. Well, that was suggested by my psychiatrist and I still am miserable. I believe him when he says I have PTSD. I am constantly anxious, cannot keep friendships to save my life, along with pursuing a romantic relationship. I shut anyone down that comes my way. Exams, especially timed ones are the worst. I always believe life is going to be terrible (when in reality, it is not) and everyone will betray me and I will end up miserable like someone I know in my family who shall not be named. Anyway, I am done trying to find a remedy. I always believe I will end up alone and even if I do, I already am and am getting used to being the introverted individual I always was. I am miserable and worried all the time, well mostly worried. I've attended therapy and that didn't help. I am going to just continue exercising a be going with the flow. How familiar are you all with this topic?
Anyone on here dealing with PTSD AND GAD? If so, how do you deal with it?
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