Hi, I Have Been On Paxil 20mg For 15 Years.

Hi, I have been on Paxil 20mg for 15 years. My Doctor and I discussed changing to Pristiq after I complained that Paxil makes me very lethargic in the morning and I sleep way too long (if given the opportunity 10-12 hours). My Doc explained that Pristiq is very similar to Paxil but is a "cleaned up newer version" possible less sexual and lethargy type side effects. My Doc and pharmacist both suggested that the drugs are so similar I could switch over immediately without tapering. The first week was amazing, no issues at all. Now I am about a 1.5 weeks in, no Paxil and 50mg of Pristiq every day and I am having side effects. Nausea, dizzy, flutters in my head, loose stool, nervousness. What should I do,Wait it out? Add back a small amount of Paxil to taper slowly? How long will this go on? I cannot work like this as I am a Flight Attendant and would not feel safe. Please help.