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Hello, I am in my 3rd pregnancy and I am 20 weeks. I have never experienced such horrible pregnancy symptoms before. My heart rate increases and I find it difficult to walk due to muscle weakness. I find myself having to sit down after standing for a very short time. I tried going shopping at Walmart and my heart started racing like crazy and I felt like if I didn't find a place to sit down I would have fallen then I started shaking uncontrollably. I went to my ob and he did not think it was my iron and he checked my thyroid which came back fine, so then he wanted me to go to my primary doctor to have my heart looked at, so he listened to my heart and said it sounded fine then he did an ekg which also came back fine so he wants me to come in this Friday to see a cartiologist, but I have been freaking out wondering if this is something serious. Anyone else experiencing something like this? Or has anyone went through this already and how did you deal with it and how did everything turn out after the baby was delivered.  Your experiences would be greatly appreciated:)