Not feeling myself since november more info please read!?

I have posted a lot of questions about anxiety etc for the past few months. I have been to someone to help with that and while it helped certain things i am still not feeling myself I do not feel this way everyday but i am tired of it happening so if anyone has anything like me please answer. Some days I will feel shaky in my arms and hands co0ld and clammy hands,heart beats faster I feel out of breath when I talk, I feel like I just need to shake my legs, lightheaded, nauseous feeling in my throat, and lately my stomach when i have these will feel full and sometimes during these I will feel like I need to have loose stools but this feeling goes away afterwards. I think it might be hypoglycemia because i felt like this earlier today and had a coke and sucker and felt better but you still feel a little crappy for the rest of the day. Could it be from being tired? any idea of what to do and if you have had hypoglycemia please give some info. I do not have diabetes but I have a high motabolism which might have something to do with it. I am 18 yrs old not on any meds what soever and am 5ft 10 and 117 pounds. I don't think i've lost any weight and I have no felt the same since my 18th bday in november any help is appricieated. Oh could it also in some way be related to stress?? my grandfather was just diagnosed with lung cancer a few weeks ago and things are not going too well with that and i am graduating next month and am not sure what to do after I don't think i'm stressed but could it be an underlying stress thing?? thanks!!!!