Hi, mattmac. I think your letter is already great, but I can make a few suggestions:---------------------
A sense of mortality began to permeate my thoughts and replaced much of my drive to perform even adequately in my academics.
This sounds a bit dramatic to me. Although I'm sure you're not
trying to exaggerate, it
sounds like you are. If I were writing this, I would leave this sentence out. You've already explained why you were struggling; there's no need to hammer it in with this sentence. Remember - you are training to regain their favor...Mentioning "sense of mortality" might scare them off instead.
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I began putting all my time and energy into forming relationships and maintaining them to help ease my feeling of loss as a self-prescribed "live for the day" antidote.
I would stop the sentence at "loss" and leave out "as a self-prescribed..." "Self-prescribe" has negative connotations (I immediately think of "self-medicate" using alcohol or drugs). The sentence will convey the same meaning without negative connotations if you stop at "loss."
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I take full responsibility for refusing to be proactive when there were steps that could have been taken to limit the damage I did to my academic reputation.
I would not use the word "refuse" - it sounds too negative. How about this: I take full responsibility for
failing to be proactive when there were steps that could have been taken to limit the damage I did to my academic reputation.
I think I'd reword the end of that sentence to make it flow better. Here's a suggestion:
I take full responsibility for failing to be proactive
and seek out the help I needed .
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OK, I need to stop there, but I hope that has helped you a little!