What Causes Hot Flashes, Sweating And Heartburn After Increasing Thyroxine Dosage?

Hi I am 41 today while out I felt hot, sweating yet cold to touch, shaking and heartburn and feeling as though I wanted to vomit. My gp has increased my thyroxine from 100mcg to 125mcg I aslo take lansoprazole 30mg and fluoxetine 40mg could this be the problem as it is scary when it occurs and usually paases in leass tgen five minutes but today was nearly twenty minutes