I tend to get sick a lot lately, its been going on for about three months now, i get colds, stomach sickness, fever etc. I get well pretty soon from each one of those, they take at maximum one week to banish but they are very frequent, also i feel cold all the time, even if theres sun and heat, my hands get so cold they hurt, im having trouble sleeping and doing excercise cause i get too tired, i cant even do 20 minutes when i was used to do more than an hour rutines. Im guessing i need some kind of vitamins but i dont know which type, what do you recomend? Btw im 21 and a male. Thanks!