Heart arrythmia

Fri 3/8 I was feeling sick as in naueous and lightheaded so I thought I take a shower. I started feeling worse in the shower so I got out. I stood up for maybe 5 secs started feeling like I was going to pass out, I passed out and hit my head on the toilet I remember staggering up and trying to make it to the door to go lay down. Once I got to the door I fell backwards and passed out this time I went unconscious. I came to with my childrens father holding my head and calling an ambulance. The emts came said my blood pressure was really low. Which is normal for me (105/55) I felt really tired and wanted to go to sleep so I decided not to go to the hospital. Fastward to Sunday I passed out again when I step out of my car from driving luckily I had someone with me. Monday morning I go to the doctor they admit me and are saying I have Heart Arrythmia and its Ventricular fibrillation. Since I have been here my blood pressure has been 74/43... 90/43 today which isnt normal for me. They said that I need meds for my heart rate but it makes my blood pressure even lower so there wanting to wait and send me home and wait a couple days and see how I feel and if Im still feeling this way then they will prescribe me the meds. Has anyone had this especially pregnant????