What's wrong with my vision?

The thing is, as we age our near point recedes and comes to a point in our 40's where we require spectacles to read near objects. Even in my late twenties i've observed my own near point recede to a recognizable distance different from my youthful vision. You said initially that you have some slight power but nothing that warranted wearing spectacles, perhaps your not wearing gles has exacerbated the pain and strain your currently feeling. In addition to the aging factor you haven't been getting enough rest, so it could be multifactorial. I would suggest you take some rest and if after that you still feel your vision is deteriorating then perhaps you should visit your eye care practitioner.Hope this helps. Good luck to ya:)