YES. yes yes yes yes. I started Prazosin in January for PTSD nightmares & since then I'm constantly cold. My feet, hands & nose go numb (not asleep) just from being so cold. I actually had gotten used to it but now I started to notice it again.
edit: It really helps with the nightmares though for me- down from having multiple nightmares, every night- to only having one every couple of weeks. So it's worth it, but if it's not helping you then you might want to switch.