Aquabat, it came from the same batch previously used.
Two weeks in heat shouldn't have damaged the 2c-i to that extent, unless as was already mentioned it was dropped in a fire...
The food with it shouldn't have affected it that much.
Really I see three things that could have happened.
1) Your scale is very inaccurate and you measured a dose too small.
2) You were tripping, but just very lightly and didn't notice without a fast come-up.
3) Someone switched the 2c-i and lied to you.
I don't know you or what kind of scale you use, but option one seems the most plausible right now (to me).
3)