Methadone Hydrochloride and high blood pressure

I have been on Methadone for approx. six months for a second time and i have been getting extremely clammy and i sweat and have heat attacks so severe, i'm so afraid of this summer, afraid i might have a heat stroke. It seems my body cannot control my heating system. Someone suggested i might be starting menopause, but i do not have sweating spells unless i'm moving around or even standing ,or if it's hot, not like hot flashes in the middle of the night for no apparent reason. Also i have always had the best blood pressure, now i have high blood pressure since using methasone for pain control and i have to take Toprol. Doctors think it's just a coincidence but i know it's the meth and i am slowly weaning off. I just hope my body can return to normal. Has anyone had these same problems.