you are not alone, many of us have had our ability to read more than a paragraph damaged by meds, or stress, or other unknown reasons. i am getting a little better after using a relatively unknown brain repair technology called Holosync. it is sold as a long term system of recovery (cure) by CenterPointe.com, where you can read (!) all about it,,

the site is a terrible thing to try to read~! so i will tell you briefly, that it works by having stereo headphones send a different beat into each ear (hidden under the sound of falling rain or other water sounds). this causes the brain to attempt to reconcile (figure out) the stimulation of the 2 halves of the brain, and that leads to a rebalancing of the 2 sides of the brain, and THAT leads to the repair of brain chemistry imbalances.

the course is about $160 to start, the first 6 months, and it lasts up to 7 yrs. it has other things to recommend it, also. you can learn meditation to go with it, since it requires sitting quietly for an hour a day, anyway. meditation has long been known to help regulate mood disorders and thought disorders, if done properly.

i am saddened to hear that you have lost this wonderful skill, and hope for your early recovery~!
Gus