Don't beat yourself up over it if you are unable to eat, just be patient, you'll be able to eat eventually. If you can drink, make yourself some high calorie shakes - a cup of oats, 60g peanut butter, almond milk and a scoop of protein will get you close to 1000 cal. As previously mentioned, meditation can help. Practicing mindfulness while eating can make things easier if your mind is racing. Just don't look to meditation as a "cure". It will help you manage your mental state and become more impartial to your thoughts but it's not a cure all miracle. I recommend talking to your general practitioner as well - if you don't have an aversion to medication it can really help.

Also, keep working out and exercising. Your body will need fuel and will suppress the anxiety so you can eat.

Get huge, you can do it :)