Sudden Heat and Chill Sensation - Seeking Advice

So, I have been dealing with something for a few years, but I don’t actually know what it is. I can be sitting down doing nothing, but I all of a sudden start to feel really flush and hot. It’s a feeling of sudden heat mixed with a chill that runs from my head to my feet for about 10 seconds, and then goes away. Once I get one, it will come back every few moments and then vanish for a few hours. It’s a very weird sensation. My mom suffers from chronic hot flashes, so I thought that may be it. I get a lot of my health conditions from her side of the family, so I wouldn’t be surprised. But she has gone through menopause already, so hot flashes are normal. I’m only 19 and haven’t experienced menopause yet, but I’ve been having these weird flush feelings since I hit puberty at 12. Some days are worse than others while some are better. But there’s never a week that goes by without me having at least two feelings like this. I have IBS-C and sciatica, so maybe it’s a part of one of those? Does anyone else experience a similar sensation? If so, do you have any idea of what it could be? It’s very hard to explain because I can’t fully put into words what it feels like.