[lofaszvanitt]

You have to literally rape yourself mentally and break down your mental barriers. Your brain works against you with all kinds of weapons like fear.

One that works is to line up a lot of things that must be done, so you can choose the less painful :D.

Also stop reading news, it makes your mind wander/think about irrelevant things. Read news only before going to bed. News is 98% noise.

If your brain is really rioting, then use a pomodoro timer.