waking every morning with shakiness, anxiety and nausea!

it's possible the medication isn't the problem.  how long have you been on SSRIs?  cleary some life stressors lead you to being examined and prescribed paxil cr.  i suffered from panic attacks in my mid 20s and was put on paxil.  it worked wonderfully, so well in fact i relied on it.  it really made me feel good along with the perks of eliminating old sport injury pains ranging from shin splints to sore joints from repetitive motion.

my doctor explained it would take 6-8 weeks to start feeling the effects of it if not slightly longer.  morning shakiness, anxiety and nausea sounds like the progression of the underlying problem.  only 3 weeks on paxil cr doesn't seem to be long enough to take effect.  similarly, you have similar symptoms with lexapro.  it seems your anxiety and stress is getting out of hand slightly.  i took paxil for 3 yrs and must admit the experience with it was absolutely terrific.  but, i didn't want it to be a lifelong thing and feel these drugs don't address the underlying issues and only treat symptoms and do a good job of that.  my experience with paxil was 16 yrs ago and i took it for 3 yrs with no issues.  my recent job of 5 yrs of being overworked and overstressed put in a bad spot physically recently with regard to anxiety symptoms etc...  the worst was sudden sweating, nausea, tremors, shakiness, facial flushing, hot and cold facial sensations.  i went to the doctor and everything checked out fine but felt like i was going through hell physically.  the worst of all were the tremors when trying to sleep.  now a year later, i chose to tough it out without medication and have made drastic improvements.  i really don't have any symptoms accept for the minor dizzy feeling when i do get stressed.  but, i sleep really well now.  i began focusing on my underlying issues and how i deal with stress.  i began exercising and getting 7-8hrs of sleep daily.  i continue to improve to this deal which is miles from where i was a year ago.

you mention being worried this is permanent which sounds typical of health anxiety which incidentally includes the symptoms you're currently having.  if your doctor tells you to commit to paxil or lexapro...you probably should for longer than 3 weeks which i feel isn't enough time to take effect.  all they do is inhibit reuptake of seratonin leaving more circulating in your blood stream.  serotonin is the feel good neurotrasmitter and the medication your taking is design to slowly and steadily increase your levels ever so slightly.  anyway, good luck. 

I've been through this. I would wake up with nausea everyday for a month and then it stopped and then it came back again. Had an ultrasound and it came back fine. It's anxiety I assure you. I'm sorry you have to go through this, I understand and I can totally relate! I'm on my relapse period so now I wake up with nausea again! Best of luck,keep us updated!