Random question, but do you think you suffer from anxiety or stress? I only ask because I have had a massive range of weird and scary symptoms in the past, from bladder pain to crazy muscle twitches (like leaping off the bed crazy) when in bed - all down to anxiety it turned out. I often feel like my legs are really trembly and weak and almost "faint" even though my head is fine. I also have raynauds (and general inability to keep warm) and migraines (might be a coincidence).

I don't have any other advice I'm afraid, but I hope you get to the bottom of it quickly.