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Thanks for your question.
Increased heart rate is a known side effect of vyvanse though only a small percentage of people taking it are expected to have this side effect.Eggs may increase the effect of vyvanse by making the urine acidic, thereby decreasing it's elimination in urine.Therefore avoid taking eggs when taking it.
If you have been having these issues, you should build up the dosage gradually by remaining on 30mg for several days before moving upto 50mg.If the heart rate still remains high , you should talk to your doctor regarding dosage adjustment or changing the medicine.
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Hear rate above 100 is not considered normal.It also depends upon the basal heart rate.If basal heart rate is higher a value above 100 may also be tolerated.In your case basal heart rate being 60-70 anything above 100 is not normal.Our body does adapt to the drug and therefore heart rate should stabilize and slow and gradual increase in drug dose should help.
There is not much to be done for other symptoms though beta blockers can decrease the heart rate but this is not the preferred method.
Can't really pinpoint anything which makes you prone to side effect of tachycardia though an anxious nature may be a precipitating factor.