help and advice on metabolism!

i was taking in only 1000 calories for a while when i was relaly struggling with an eating disorder and am planning to raise it by 100 cal a week at a time, i expect this to cause weight gain til my body adjusts its metabolism from being so slow in "starvation" mode to what it really needs, but how long does this take? what's my body going to go through?? any support, tips or advice?

Raise it faster and your metabolism will catch up quicker.  At 100 cals a week (you're under 21) you'll still be undereating for the next 8 weeks and your metabolism will still be depressed as a result.  Plus you'll have two more months of malnutrition with all that implies.   Enter your stats here http://www.kidsnutrition.org/bodycomp/bmiz2.h tml to see what you need and increase in 500 cal steps until you get to the right amount.  You'll gain faster in the short-term but you have a better chance of a quicker stabilisation.

ahhh, that gives me a better idea...but how much and how long will i initially gain? this is obviously a rut to get out of, but i want the least "side effects" so i'm not tempted to bail out and restrict. its complicated stuff!! wish i could just snap my fingers and make everything simple. but i know my metabolism is in the reserve mode, and i wana put it back into normal so i feel safe adding the calories i need...but im scared because if i've been maintaining on this, i feel like i'd explode growing if i upped it to where i need it! just lookin for advice and everything. i know all the basic information, been into nutrition, health and dietetics wayy too long

If you eat the amount recommended in that website, technically you won't gain an ounce in the long-term because you'll be matching your energy needs with your food intake.  In the short term you might gain nothing, two pounds, or ten pounds.  The flipside of crash dieting and starvation is short-term weight gain.  How much and for how long depends entirely on the individual

If you feel 'scared' about the prospect of any weight-gain then you have a problem.  The choice is.... either keep abusing your body on too little food and suffer the long-term consequences of malnutrition... OR.... look after your body with a healthy diet, the right amount of food and 'suck up' any small weight-gain as something that you have to accept as a result of what you did to yourself already.