Mental fatigue and life

Hello, 

I’m waiting to be assessed for Autism and I’m trying to understand more about what the difference is between mental exhaustion and physical exhaustion.

Usually if I feel tired or ‘not right’ I’ll have a sugary snack but it’s not made a difference to my energy levels recently.

I’ve been more critical about my appearance, more obsessed with emptying my bowels and eating ‘clean’. The gym has become non-existent. I simply can’t place myself anywhere right now that will make me feel better.

I am also crying a lot and breaking down over guys and thinking I’m ugly and shouldn’t be seen by anyone. 

I feel constantly stressed out of my mind and I wish I could sleep and wake up feeling better but I’m not tired in that way. 

I’m really struggling with this.