I don't know if your palpitations started before you were taking Xanax or not, but I also take Xanax and I've noticed that if I take it for more than 2-3 days in a row I will start having palpitations. I've also had a couple of different antidepressants (SSRI's in-particular) cause me to have palpitations.
Plenty of possibilities that can lead to these symptoms.
For fatigue, in addition to the CBC, you should be evaluated for thyroid disorder, b12 deficiency, as well as infections causes, like Epstein-Barr virus.
Palpitations can be evaluated with a Holter monitor, or event monitor, which can record any dangerous arrhythmias. I would also obtain an echocardiogram to image the heart for structural abnormalities.
Also, the muscle weakness can be evaluated with some of the aforementioned tests. Obtaining acetylcholine receptor antibodies can be added as well to exclude myasthenia gravis.
A referral to a cardiologist and neurologist can be considered to evaluate the palpitations and weakness respectively.
Lastly, if food gets stuck, a barium swallow or upper endoscopy can be obtained to exclude a blockage.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin Pho, M.D.
www.kevinmd.com
www.twitter.com/kevinmd
have you been tested for lupus...i have it and sounds like me.
I am no doc either but it sounds like, hypothyroid, low iron or low cortisol /sodium Ive had alll of them
I am no doctor but suffer from thyroid disorder/hashimotos and your symptoms sound like a possible thyroid problem, have your doctor run a FULL thyroid panel... not just a tsh.
Good Luck!