I'm heading out the door to go to work, but I took a few moments to crunch the numbers for you. Assuming a moderate activity level, your TDEE is about 3000cals/day. To gain weight, add 500 cals/day to come up with a caloric target of about 3,500 cals/day. Using a 40/40/20 macro split, you will need to consume about 350 grams of protein per day. Compared to your 2,000 cal/day original target, you would NEVER gain with that plan. And I'm thinking your original plan had you in a protein deficit (catabolism) which would actually make you shrivel instead of grow.
Let me know if any questions. I'll try to respond in about 12 hours after work.
---Roman
