I have experienced all of that, and have chest pain as well. I think it's from lifting babies, and for me being overweight! I'm on Zoloft, and it does help, and I take Xanax when I need to relax. Go to anxietyc entre.com, and they list all symptoms and describe them. Very helpful! I have two children as well, and I had to go back to work to help with my anxiety. Staying athome full time can be very lonely at times. I think it's normal to feel that way, it's a hard job. I also started crafting and opened an etsy shop, and that took my mind off stuff. But, the anxiety definitely has affected my marriage, and friends because all I want to do is get reassurance that everything is ok. I hope this helps. Also, google health anxiety,and there are a lot of self help websites out there about how to overcome it. Take care!
I hate to sound like a broken record but this definitely sound like panic attacks/anxiety. Do some research online to see if you have those symptoms. If doctors did a chest X-ray and all those tests you should rest assured that its not something wrong with your heart. Being a mom is not an easy job and can overwhelm you at times. I am on zoloft for my anxiety, if you want to hear other people's personal stories with zoloft then go to drugs.com to read zoloft reviews. You might read something that will relate to you. Hope this helps
Take care of yourself!