It sounds just like anxiety. I have the same symptoms. Your body is "overflowed" with adrenaline, constant in a fight and flight modus -and this affect our bodies in many ways. Try to read a little about it on this forum and I am sure you will get many advice. (f.ex lifestyle changes, changing thoughts, medication etc). If you are not reassured by your docs answer, get a full check up, and if everything is fine-focus on adressing the anxiety. Its not necessary to suffer with this condition for a long time. Also, Claire Weekes (doctor) has written some really, really great books on anxiety/nervous suffering, and how to overcome it. Try to google her name and her books "hope and help for your nerves" and peace from nervous suffering". Take care!I know how you feel!
Why don't you try a different doctor to get a second opinion. It sounds like you are under incredible stress so you might want to try talk therapy too.
Are you taking both Celexa and Lexapro? They are both antidepressants and the side effects from either one could be causing some of the symptoms you are feeling.