Don't push yourself.
(But I must! I need to force myself to do something, there's so much work, and I have so many "shoulds", the time is running out, but I just can't, and... aagh!)
Shhh, it's okay. It's okay to be overwhelmed, really. So just let it be, for a while. I know it's hard, embrace it. Write your feelings down or cry, if you'd like to.
Now splash your face with water and make yourself a tea/coffee/cocoa/smoothie.
Sit down at the table. Drink your beverage.
Grab a piece of paper and a pen. Drink.
List all of tasks you want to accomplish. Breathe deeply. Drink.
Choose one task from the list. Drink.
Grab another piece of paper. At this point, make yourself another tea, etc.
At the top of second paper write your chosen task. Drink.
Break this task into MICROSCOPIC chunks, e.g. instead of "write 20 pages of an history essay", try "prepare books + open text editor on your computer + write 5 words + write 1st sentence + write 2nd sentence + write a paragraph +...+ print this draft+ read sections of your writing + mark mistakes + correct them + retype your essay + final check".
Another example: instead of "going outside", try "get up from a bed + take off pyjamas + dress up + wash face + comb hair + put shoes + pack a backpack + walk out".
Don't feel discouraged that this chunks look small, insignificant and goofy - that's exactly the point! They look tiny, but your goal is to simply start. Smaller is better and more powerful. Don't worry about the outcome, try to focus on the process.
You should now have a second list, filled with baby steps, leading toward finishing your first task. Congrats!
(After a break: take first chunk, complete it, cross it out from the list and reward yourself. Take a second one, complete it, cross it out and reward. And repeat your actions. Repeat. Repeat. Repeat and conquer your world.)
But for now, you deserve a reward! Treat yourself, because it wasn't easy. You are already a stronger person, because you asked for help. You don't need anything else.
Take a good care!