No sure if I trust...

I'm not sure I trust my Dr's nurse or assistant lady. Since the start of December I've maybe had a total of 5 days off of my period. She says not to worry because it's probably just my body being messed up from my hsg test but I feel like it should be "normal" again. I just got done with my 3rd cycle of the month of December 2.5 days ago and am again bleeding. I'm getting very weak and tired and my immune system is not good because of all this. I'm not sure if I should just trust her or try and get ahold of my actual doctor or maybe even just go in to get checked out? I'm not even sure there is anything they could do to fix it...