Palpitations on minoxidil, what should I do?

I am 23 years old. I was told to start topical Minoxidil (rogaine) a few months ago by a specialist in my city as a preventative measure for hair loss.  However, I started having heart palpitations and chest pain while using the medication. It’s a bit difficult to reach the specialist on short notice, so I thought I would reach out to you.  Do you suggest that I stop using Minoxidil while I wait for an appointment? I’ve been using it for three to four months now so I imagine I’ll begin shedding heavily after stopping it.