Prolonged neck pain after lymphatic drainage massage

I got my first lymphatic drainage massage 3 days ago (Thursday). I felt amazing afterwards. That night I think I fell asleep in an awkward neck position because I woke up Friday with a very stiff and sore neck. I didn’t really think much of it since sleeping wrong does occasionally give me pain in my neck the next morning. I went about my day Friday in mild but tolerable pain. However all day on Saturday I was very fatigued and it is now Sunday morning and the pain/stiffness is still there. Should I be concerned? It’s flu season, perhaps that could be part of this? I have no fever or headache.