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Headache After Taking Weightgainer

I was on weight gainer for about 5 weeks. Then I took three weeks off (vacation/home reasons. yes I know i am lame).

when i came back, i tried to get back on my weightgainer but now whenever i take it, i feel my stomach balking and i get a headache afterwards.

does this have to do with insulin resistance? am i becoming diabetic?

22 years old
154 (after not eating right/supp. for 3 weeks)
typical caloric intake: 3000 kcal
current weightgainer has: ~600 kcal ea. serving (I do one a day)