Hey there HeyThere,
Firstly, we don't advocate starvation at all. I am a vegan who, within the past few years, recovered from being severely underweight (>17 lbs under weight) so this is an issue that is very close to me.
The first thing I want to check, if you wouldn't mind (you can send me a PM), is what your height and weight is?
Secondly, what kind of vegan foods are you eating? Wholefoods, or processed foods? Are you keeping hydrated? (Hydration is a big factor in weight loss - i.e. you need to be hydrated to lose weight.)
Are you supplementing your vegan diet with exercise? If not, you absolutely must. You need muscle, not to mention cardiovascular muscle, and starvation forces the body to eat muscle as well as fat - including heart muscle!
Please do a quick search on the forum of something called the 'Herxheimer Reaction'. It is relevant to your case.
On the whole I do not think three months vegan is long enough to be concerned. The Herx period is generally a little longer than three months: in my case it was 4-5 months.
You could look up a diet called 'Raw Til 4' which reports weight loss results. It's a vegan diet you just eat uncooked foods before 4PM and cooked foods after 4PM.
Lastly, and it is lastly, you could very carefully - very carefully - use calorie restriction. But since you display signs of letting this get out of control, such as suggesting you will starve yourself, I really don't think this is wise. I've been there, and now I'm having to see various specialists to make up for the awful period of deficit I put myself through. You should never, never, never eat fewer than 1200 calories in a single day. You should not lose more than 2 lbs per week. Anything more rapid is considered starvation which is so very rarely wise except in very particular cases, under medical supervision, where short periods of fasting can help with serious other chronic illness. As a result of starving myself for even a short period of time - because I didn't do it long - I have seriously damaged my heart, skin, and hair. I also damaged my kidneys, bladder and liver but luckily they all made a full recovery. It's just not worth it, it's dangerous, playing with fire.
If you feel you need it, please also consider talking to an ED recovery forum about your thoughts of starving yourself. But, also, feel free to send me a confidential PM any time.
Vegan love.