I want to do better, I want to get better

I want to do better.  I had a doctor's appointment today.  I always get anxious before one.  So I was very high strung this morning.  I was seeing her for my eye twitching/jerking and for my indigestion problem.  I had basically convinced myself that I had a brain tumor of some sort.  We talked about it and she said that I would have more symptoms and she wants me to see my eye doctor and have him check out my eyes.  And for the stomach problem she wants to check my gallbladder with an ultrasound.  She did make me feel better about my anxiety problem she offered to start me on medication to control it but I want to try to get it under control without.  But tonight I am regreting it.  I had a great afternoon but now I am anxious again.  I went on webmd tonight (never a good thing because it just gives me ideas) because I wanted to look up a new symptom I was having.  It is going to sound weird but my mouth and jaw have been tired today like I have been using them alot only I havent.  Anyway while I was on the website I read an article about the symptoms of a female heart attack and I had a couple like upper belly pain, tightness in my chest and a couple of others.  I know that my stomach pain is probably indigestion and the tightness is caused by stress and the tiredness is because I am tired.  But  why cant I convince myself of that fact.  WHY?  Part of the problem is that I am seeing a cardiologist for a heart murmer and having an echocardiogram on the 24th.  But even the cardiologist said it was very unlikely a woman my age would have one especally since I have no family history.  And just when I convince myself of that I will have a new symptom and I will convince myself of a new deadly disease.  Like some form of cancer or some incurable disease that the doctors have missed and will only find when it is much to late.  I thought I was getting better and now I feel I am back where I started.  I want to get better.