I would not look any further than that.
Occam's razor.
The Lorazepam is a CNS depressant, and a powerful one, so it makes it harder to concentrate, it also has strong amnesic properties, that means you will have a much harder time forming stable long term memories.
The Zyprexa and the Prozac will mess with your dopamine and serotonin receptors, making strong emotions almost impossible, and memory retention is strongly linked with emotional arousal. Concentration and enjoyment will also be real hard.
That cocktail of drugs is really stacking the deck against you.
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In the middle of the journey of my life I found myself astray in a dark wood where the straight road had been lost.