ok,, congrats on giving up meat.
here are a few pointers:
Meat has a LOT of calories.. so its filling and gives a lot of energy.
Vegetables and Fruit has far less calories. So if you are eating the same size portions, then yes, you are getting less calories each day.
basically EAT MORE,, and you will be getting enough calories,, and you will feel fine.
2 weeks is a very short time to have any ill effects. so this is most likely due to you not eating enough.
vitamin and mineral deficiencies wouldnt happen for many many months,, if not longer.
BUT.. just make sure you are not over-doing the junk food.
just because someone becomes a vegan, these days (with all the choices of snacks, cakes, pre-packaged meals) vegans can also have a junk food diet and get unhealthy.
if you want to be healthy at all,,, then reduce the fake meat products,, and increase the green veggies,, and colourful veggies and fruit.
Green veg is best (nutritionally) followed by colourful veggies, followed by white veggies.
ALL veggies are good. But just wanted to let you know a general guideline.
if you are not sure how to 'fill yourself up', then eat some more dense (but healthy) foods. ie: bananas are an amazing fruit. high in vitamins and minerals and low in fat.
(i make a banana smoothie for breakfast every day. i use between 5 to 8 bananas in the blender with about 2 cups of WATER. sometimes I put a heaped spoon of Flax Seed POWDER in there too)
this is a great breakfast,, and filling.
I often have this as lunch or even dinner. (been doing this for over 10 years.. and love it).
of course, enjoy some junk from time to time...
depending on what country you are in, there are LOADS of vegan burgers, vegan nuggets, etc.
dont expect them to be exactly the same taste as a real dead animal. you just have to accept its going to be 'close', but not exact.
I prefer burgers that dont taste too much like real meat,, (coz it grosses me out).
But,, Linda Mccartney burgers are quite good.
you shouldnt need to pay a fortune for vegan products. (its a bit of a fashion craze at the moment), so many companies are 'cashing in' on it.
if you are in the UK, then check out the range of products in Iceland (shop).
in America or elsewhere I dont really know the shops.
as for the IMPORTANT stuff:
make sure you take Vitamin B12.
do not take any multivitamins. coz they have too little of the important stuff.... (you end up wasting your money).
so just buy some B12 (preferably a spray,, coz stomach acid kills the B12... so a spray in your mouth dissolves under your tongue directly int your blood and avoids the stomach acid).
also: if you dont go in the sun often, then get a vegan vitamin D. (especially for winter).
if you want Omega-3, then buy flax seeds and GRIND them into powder (use the coffee grinder attachment that comes with most blenders). if you dont have a blender at home, then get one! coz they are mega useful for banana smoothies. (make sure you buy one which has a coffee grinding attachment... as you will need this for flax seeds).
if you cant be bothered, then just buy flax seed powder which has already been ground. (but its much more expensive this way).
2 spoons of flax seed powder per day gives you all the Omega-3 you need (if you are under 40 years old).
if you are older, then you should look at Vegan Algae Omega-3. (basically this is where fish get their omega3 from). its more absorbable than flax seed powder (for older people).
eat a handful of nuts each week. (not per day, but per week). walnuts and brazil nuts would be your BEST choice. (both are proven to extend life and reduce sickness).
finally: DRINK ENOUGH WATER EACH DAY!!
so many people ignore this one!
if your pee is anything more than yellow, then you are dehydrated.
it should be a the colour of straw. not dark yellow, and definitely not brown).
always drink enough water. your organs all need it!
2 weeks is a very short time,, so really this is just a calorie issue.