Anxiety?

I am doing ok right this minute but that changes minute by minute.  I will get myself calm one minute and the next I will freak out.  I have plenty of health worries to choose from.  1. Heart palpitations, 2. chest pressure pain, 3. Sometimes hard to breath especially when walking around but sitting down I feel better.  4. Mouth, jaw, neck weakness. 5. Aches and pain.  6.  Sleeplessness.  I sure their is more but those are the ones I worry about most.  I am to have an ECG for the palpitations on thursday.  I need to tell the cardiologist about the chest pressure and pain because that started this past week after I saw him.  I am now worried about what they might find.  I am not sure what to do are these symptoms anxiety or something worse?  I am trying to rely on God for comfort.  I dont know if people read other people's journals but If you read this please pray for me for my appointment on Thursday.