I just started working out a few months ago and just yesterday decided to try whey protein to help with my fat loss, which I haven't made much progress in even after switching to a healthier diet.
I bought Whey Gold Standard from Optimum Nutrition, please refer to picture below.
Yesterday before dinner I decided to try a scoop of it with cold water. I drank a few gulps and immediately started to feel tingling around my body. I brushed it off and started eating my dinner consisting of brown rice and some meat and veggies. Throughout the dinner the tingling got stronger, I started feeling light headed, and my heart started racing. I called my friend who uses the same product and he said I am one of those people sensitive to whey protein and my blood glucose level is dropping. I ate some more and started feeling better after a few hours, although I don't know if I felt better because of eating or just because of time.
Today I worked out at the gym and afterward I ate a bigger dinner than usual consisting of fried rice, chicken, carrots and cabbage, to prepare myself to try the whey again. This time after drinking the whey I did get some tingling particularly around my head, but rather mild. My heart did not race. As I am typing this my head is still tingling, but it's very mild.
My questions: what is this reaction? And is it safe for me to keep taking whey protein?