I cant sleep.
For the last ten fucking years I have had sleeping problems, but over the last month it has gone out of hand.

I cant sleep at all, and when I do fall asleep after 24+ sleepless hours, I sleep for 10-16 hours and again go for 24+ hours without sleep.
Over the last week I have forced myself to sleep even when I dont want, I stay in bed for 5+ hours and fail to find a single moment of sleep.

I cant have a normal life because of this. I cant go to my institute, I cant do anything.

Please help me.

I also smoke over a pack a day and I have not eaten anything decent in days, just cant eat either.

Also, over the last week or so, my hair started falling out. And I am 20.

Start with the food part, you can pretty much force that, even if it does taste like shit.

Next, exercise as a crazy person. If you're exhausted at the end of the day, you'll sleep (and eat).

Weed with some relaxing music just before you go to bed can and will help.

I cant eat, if I would try to force myself I would puke.

I am too tired all day long to have any excercise. My only excercise involves walking out of the house for a smoke.
Weed is not an option.

Only a crazy person would expect different results from doing the exact same thing. You have to start somewhere, either the working out thing or the eating part, but you gotta make a start. Get a job?

.... Cancer?
Don't know man, but when your hair starts falling out it's bad news.

Something called 'going to the doctor.'

Do you consume a lot of Caffeine?

sleeping pills

If I were your doctor (which I am not, by the way) I wish prescribe to you each of the following:
Quit smoking now, a pack a day isn't healthy. If you have trouble quitting, fucking deal with it if you are serious at all about getting healthy. Putting it off is not helping, your pysical addiction is going to override any small anecdotes, no matter what. Just throw out your pack and buckle up.
Eat. Qutting smoking is probably going to keep you from being very hungry for a little while, and than you'll realize your hungrier than you've ever been in your life. Go get a steak, finish your plate, and get dessert. Wait untill you haven't smoked for a little while to eat this one-hell-of-a meal that will probably be enough to restart your eating habits. The pack a day is probably madly suppressing your hunger.
Relax. Insomnia is some crazy shit, but if you spend more time out of the day kicking it huck finn style, kicking it somewhere nice, you will probably find yourself a sleep soon enough. Just chill, it sounds like you're overworking yourself too much as it is.
Exsercise dude! An hour of walking between classes is not enough, why don't you join a gym or go for a run or something?

As your doctor I also highly suggest you start this routine by smoking a big fat bowl of green weed. That will probably help.


End.

Melatonin could help, plus it's available OTC