healthy snacks for kids to make, lunches, parties, on the go

I am sure I have deficiency of some Vitamins in my body. But I don't know which Vitamin.   Is there anyway to check which vitamins are less in body so as to balance vitamin's level in the body?    I have dark circles around my eyes due to extra working in nights and less sleeps. It seems that they are permenant. Pimples are there on my back, face, shoulders, head, chest, arms. Not too much, but at least 1 pimple I have at a given time at any one of the above mentioned places on my body. Pimples having pus in it and sometimes I have to wait 2-5 days to get rid of pimple which then excretes pus. Initially it is red then after somedays pus discharges then it leaves mark (scar) on the effected place. If the scar is dark then it takes 2-5 months to vanish else it becomes fade in 3-4 weeks.     After shave I wash my face with 2 to 3 drops of detol mixed in water, then my skin becomed more white and dry. This is very iritating and paining sometimes. I was doing so to kill any bacteria or avoid any infection due to shave on my skin.    I first got pimple in 1995/96 when I was 15. Initially it was very less and rare but year by year it increases and spreaded on all over boddy. In this much period, my face skin is brken from chicks. I can see holes (very small). I am really dissappointed with my skin right now as compare to the skin I had in age of 15. I am sure one will think twice before kissing my face, but my colleagues still use to slap freindly on my face [it's not that bad].    Sometimes I thinks that, I have excessive amount of pus in my body which is discharging in form of pimples.     My hairs are also become weak and little bit white. I am thinking to get bald 4-5 times a month with a week difference. One of friend told me if you do this, after 5th time you will get stronger and thicker hairs.   My origianl skin color was very fair initially but now it becomes darl. Still if I shave my mustache - a clear white skin will appear which will miss-match with my face skin color. This is one of the reaons I never sahved my mustache .   I am really bothered due to all this disturbing phenomena. This sometimes effects my professional and social life. I am not using any medicine for this disease. I prefer more to treat this disease (pimples, pus, hairs, black circles, color complextion) with natural substances like lemon juice, honey, milk etc. But I never tried one due to lack of guidence.     When I was 18, my elder cousin told me that this (pimples) happens in puberty and when you will be 25 it will finish. But I still have pimples (less than what I was having in 18-21). I never care about it because of my engineering studies and tight rutine. But now I am having cool job, siting in AC from 7:30am to 5:30pm. I am ready to fight with this deisease but do not have guidence???? what is right and what not?  Knowing all this about me and my condition, I request some specialist/senior/expert to please help me and guide me in right direction. Any special soaps, procedures, creams I have to use? This will be a great help for me!!!! regs, riz. electrical engineer [having very less knowledge in medical sciences]