I am glad I am not the only one who feels this way. If you find any answers please let me know, and I will do the same.
Omg...I am 37 yrs. old and just started to feel the same way latter part of May 25, 2012. Still today i get this and what my doctor has told me that thru age...we women from age 30's thru our 40's go thru this. I've had my blood work done and everything came back fine. All those symptoms, sensations, etc to what i was told was a anxieties. I believe it has something to do w/age and hormones if we are not already stressed out daily about life etc. Good Luck...i hope you have a great support group and routine you enjoy doing such as exercise etc. Not to mention herbal tea (caffeine free) also helps.
Sounds like postpartum thyroiditis, which is a hyperthryoid condition that happens after a pregnancy.
In this article, this paragraph pretty much sums it up, but there's lots more good information in the article:
Symptoms during the hyperthyroid phase of postpartum thyroiditis are usually milder versions of general hyperthyroidism symptoms, including anxiety, muscle weakness, irritability, heart palpitations, fast heartbeat, tremor, weight loss, and diarrhea.
http://thyroid.about.com/cs/pregnancy/a/postpartum.htm
Testing for thyroid abnormalities is EXTREMELY tricky, and doctors will often say they tested for that and were able to rule it out, In fact, you could be high normal in one hormone, and low normal in another, and feel completely out of whack - it's the endocrine hormones in balance that matter, often not the basic numbers of each test. Best wishes.