Just wanted to give my input - I did a round of dumb-high dosages of amphetamines (mostly Vyvanse, but sometimes Adderall too) last year when I was dealing with numerous finals' papers (and the research involved with them), all around the same length as the OP's paper:
I was right at 220 pounds, and although I usually stuck to 120-max 180 mg of Vyvanse there was one time when I took around 300 mg of Vyvanse in a 12-16 hour period. I had the same thoughts about Vyvanse and how it wasn't really even supposed to be able to be abused, but yeah, if you take it up to the 200-300 mg. level, it's just not pleasant anymore. I became hopelessly stupid about a lot of work that I was doing and became almost idiotically repetitive at that high of a dosage. This happened just under a year ago, but still, I'd say that the high doses of Vyvanse that I took made up some of the dumbest drug decisions that I've made my whole life.
That being said, I think higher than normal doses of Vyvanse are still preferable than taking higher doses of Adderall (IR or XR), but still, above 150-200 mg, shit starts to change and fast.
You should be OK, I think, because of your size and everything, but the best thing you can do is get well and re-energized by taking a lot of fluids and eating healthy. Also, I would lay off the Vyvanse for a good while...after big doses of Vyvanse, I could take it again in a week or so, but I just had bad memories of when I did 200-300 mg. at a time.
The funny thing is that I still think Vyvanse is the preferred amphetamine pill as far as how much work you can get done plus the mildly pleasant euphoria which is completely different than Adderall - that being said, be very careful with it, my friend, that shit can sting you hard when you're doing too much of it. Best of luck dude.