The med thing was the first thing that came to mind......in particular, like skooz said, Cymbalta caused me a massive amount of sweating and overheating very easily.....Also back when I was on a high dose of Fentanyl Patch, the spikes in pain relief when changing 3 day old patch to a new patch caused severe chills/clammy/sick feeling (withdrawal-like symptoms).....so by going to a much lower dose of the patch, it kept it more evened out and the spikes are no longer happening.
When our hormones are effected, males OR females (example: opioids are a known culprit to deplete hormones), we can get 'hot flashes' and other strange episodes, not necessarily always 'menopausal' in nature....

physically, once I got my thyroid issues straightened out, it helped me to regulate my normal body heat, amongst other functions
Our Thyroid is our body's 'engine throttle'..... I had NO idea how important our thyroid is to our entire adrenal and endocrine system until blood tests revealed hyPOthyroid.......sluggish.....gained weight simply by breathing the air , intolerance to heat/cold extremes........

Regarding the dietary eating trigger......in my case the 'bad carbs' (sweets) triggered pain spikes/gluten intolerance issues.....
Maybe if you kept a simple journal of what you ate when you noticed the symptoms kick in.......I noticed on several occasions if I ate a few salty potato chips, It would spark a hot flash type of thing.......iodine reaction....?

Just throwing things out there......our bodies are all different of course....
Getting a glycemic/glucose tolerance test may help in either targeting a culprit or at least aid in the 'process of elimination' and ruling out things like diabetic risk factors, etc.
Probably need a good blood work up to see what your numbers are.....

It takes a frustrating amount of constant detective work......
I hope you can pin down some possible