It happens to most of us!
You need to take a week off - literally lock the books out of sight and go away.
Not far away, even stay at home, but take a break and go to airports. Stand on the perimeter roads near the threshold (you might get moved on but in my experience they will leave you alone); let the Airbuses and the Boeings and turboprops pass over your head; smell the fuel; go inside the terminal and be an anorak for a few days; check out the pilots; watch them walking to the planes; see them on the flightdeck - that's where you want to be!
You went down this road for a reason: now go back and remind yourself WHY you did!!
You're almost there, mate!!