Health anxiety and period/PMS/PMDD?

I thought I might reach out to others about this right now, since it's kinda taking over everything, and I feel like I have no real safe place to turn to and be heard. I suffer from very extreme health anxiety.

The health anxiety started soon after we lost our baby during childbirth last year, and I've very clearly noticed a pattern. Two weeks before my period begins, the health anxiety kicks into overdrive. Last time I was absolutely convinced I had a blood clot in my leg that would kill me (turned out to be nothing, of course). This time around, I'm convinced it's breast cancer. For a few days before my period starts, I get so bad that I've actually checked myself into a hospital on multiple occasions just to stay safe. It lasts until a day or two after my period ends, and then for about a week it's either completely manageable anxiety, or I don't notice it at all - a total sense of freedom compared to the misery I'd just gone through.

I was wondering if anyone else goes through this? I'm currently cycling through doctors trying to find one who will take me seriously, which is proving more difficult than I thought. Most don't even factor in that I've documented/journaled that this starts at the same exact time every month, or straight-out tell me that it must be a coincidence. We're moving next week, and I'm hoping the doctors in my new area will be more open to communication and helping me figure out exactly what I need. But it's left me feeling completely alone, completely frustrated, and completely overwhelmed.