Zyprexa (20mg Olanzapine) and Klonopin (Clonazepam) can cause hair loss.
Drug-induced alopecia usually presents as a diffuse, non-scarring alopecia most commonly involving the scalp. In almost all cases there is recovery of hair loss within 3 months after discontinuation of the medication.
Hair loss, and in particular telogen effluvium, may also occur in response to a number of triggers including fever, hemorrhage, severe illness, stress, and childbirth, and a thorough exclusion of these potential confounders is necessary before the hair loss can be attributed to the medication.
Stress can increase hair shedding but it grows back as normal. If you really believe you have hair loss from stress than it is probably just an increase in hair shedding and not the bald patches some people get.
Even more likely, is that you have an increase in hair shedding from being in winter.
If you have hair loss in a pattern, it is safe to assume that you have Androgenetic Alopecia and not hair loss from anything else.
By the looks of your pictures, you only have Androgenetic Alopecia at the early stages.