I need some positive thoughts please.

I posted earlier and I'm sorry to post again. I'm just feeling SO incredibly depressed. I'm 19 weeks and have been having issues with dizziness and such so I had an ecg and it was abnormal. I'm so frustrated because no one told me anything else. They're sending me to a cardiologist and that's fine. They're doing their job. But I called the office just asking if I need to be immediately concerned about the baby or if this is mainly for me to get checked out, etc. My doctor knows I have severe anxiety and she put me back on my meds and I've felt nothing but depressed since. I understand she is very busy, but I was told I can call anytime with concerns. And I've waited over two days now to hear back and nothing. All I want is a more specific understanding of why they're sending me. I go for an echo on Monday now. I've cried all day today. Even after seeing my baby on an ultrasound. I feel so down that I don't want to get excited about anything because I have such a deep fear that it just won't work out. Please, does anyone have any advice?