I would keep that job no matter what. I can't imagine what personal issue suddenly came up, that you didn't have when you accepted the job, but now you do have. If your personal issues are health, do your absolute best to work through them. If your personal issues are relationship, deal with them on your off hours--chances are your partner will leave you anyway, and they you will be stuck without a job. If they are childcare, call everyone you know, ask what your co-workers do, there is certainly some solution to the issue.
You would be better off asking for suggestions on how to deal with working full-time and your personal issue. As other's have said, if you quit, it will be unlikely you ever work in pharmacy again, and it will be very hard to get any job at all.