Granny,
I also have the very low pulse but not the bp. My bp is almost always perfect. It sometimes gets a little high if I'm worked up, but mine also does not respond to pain. I have heard of people that faint from immense pain so perhaps in those people their bp drops? I've had the cardiologist check out my low heart rate and they can't seem to find a cause. My heart rate only recently dropped though, it was consistantly mid 50's to 70's and now it's mid 40's to low 50's. Like you I tend to sit around 48, it gets down to as low as 38 in the middle of the night. Since the cardiologist can't find a cause she just says it's doing it's job efficiently and I'll know when/if it's too low because I'll pas out - thanks doc :)
I don't know that specifically low heart rate and bp is related to fibro because some people have tachycardia and high bp. I do however think that there is something to be said for our nervous systems not functioning properly and therefore having these problems that aren't always responsive to medication/treatment.
As far as the chronic hives are concerned I'm interested in hearing more about that. I'm sure you've been to the allergist to rule things out, but do your hives not respond to antihistamines or steroids? I'm currently on my own search for answers and I have come across things that say that hives come with hypothyroidism sometimes - have you had your thyroid checked out? That would explain the low heart rate too maybe... I have had (knock on wood) very few hives that pop up and seem to be idiopathic. I am actually going back to the allergist in a few hours to run just a few more tests. I only had hives related to allergies in the past and in August I had an anaphylactic allergic reaction and in Novemeber I began getting random hives only a few at a time. I know that hives can be idiopathic, especially chronic ones, but I would be curious to hear a little more about when yours began, if they respond to treatment, how often you get them, etc.
I hope you find answers soon!