What Causes Nausea And Sweet Smell From Feet After Removing Shoes?

I am a 22 year-old female. I noticed this year, maybe even before, that when taking off my shoes after getting home my feet smell sweet which I find so odd. I ve always disregarded this but now really wonder why. This week I have been having some nausea though it s not too uncommon for me. Either way I think something is going around in my class since many are complaining of the same thing. I weigh 122 lb. and am 5 8. This is a little more than 10 lbs less then last year and I don t workout like I use to. I barely work out at all anymore sadly though I m trying to start up again. This year has been stressful and I assumed they both led to the weight loss. I m usually drained and tired, but such is the college life I presume. My glucose levels have been a little high in the past but I have never been found to be diabetic in the past. I don t have any signs of constant thirst or urination with the exception of random days. In fact, I haven t really been craving a lot of water lately. I don t eat perfectly but I eat pretty well. I seem to not be as hungry as usual lately. I eat meat on occasion - chicken, turkey, rarely beef. Should I be concerned?