We begin our withdrawal in earnest, enthusiastically! (Two weeks- I can handle that!) But soon we feel like something's wrong: "I should be over this by now! These symptoms must mean I've contracted some disease!" 4 weeks, 6 weeks, 8 weeks, 2 months, 3 months, 4 months- Nausea, vertigo, muscle pain, joint pain, headaches, tinnitus, sex life ended, cognitive impairment, loss of sense of smell, anxiety and panic, more depression, memory gaps and so on. It's deep deep water!
It takes months, not weeks; you have to be patient. It slowly gets better.