Hello, does anyone take this? I have been taking 75mg for nearly 3 weeks. It's definitely helping, but it's making me feel absolutely exhausted. Has anyone else felt like this on it? My GP gave me the slow release to try and avoid this, but it gave me awful insomnia and nausea. Otherwise it's working for me, but I don't know if I can continue with this awful tiredness! Any anecdotes of experiences welcome.