Should I accept the fact that i have generalized anxiety disorder?

Im a 20 year old female. About four months ago i went to my physician because I was have a racing heart and some palpitations. She did some blood work and found out I had hypothyroidism. She said my symptoms should go away in a few weeks. They didnt go away and I ended up going to the emergency room about a month later where they told me I had an anxiety attack and they diagnosed me with generalized anxiety disorder. I went for a few more weeks. Throughout all of this I have been experiencing some frightening symptoms. I have had a racing heart throughout everything, headaches, I feel like im not here, like im in a gl bubble watching people around me. i have had snowy vision my entire life but i think it has gotten worse recently, ringing in my ears, numbness/tingling on my ears, neck, arms, legs, nausea. Im so afraid that something is seriously wrong and they havnt found it yet. With my brain or heart? I went back to my physician about a week ago and she prescribed me zantax to take whenever i need it. Im not a fan of taking medication so I have only taken it about twice. Its a very low dose too. My symptoms seem like they are getting worse, so i went back to my physician this morning and she wants to take me of my thyroid medication, and prescribed me zoloft to take everyday for six weeks. then come back and retest my blood levels and see if the anxiety is truly the issue. I just want to be healthy again, I have never had any health issues before this. Do I just need to get over this and accept the fact that it is really all in my head and I just have an anxiety disorder? Thank you so much for hearing me out and I appreciate all the help. I have spent hours online looking at sites trying to reure myself that im alright.