It's normal. It will pass. I used to feel exactly the same. Try to do something physical, like working out, running or just walking. It helps to get you back in a better mood. For the concentration issues, you probably have brain fog. That will also go away, but it takes more time. Just make sure you eat healthy and food that you know is brain friendly. As for porn, stay away, because will just reset the cicle and you will have to suffer everything again. Good luck to you!