I'm writing this letter not to give advice but to acknowledge what you feel. 

It's okay to be sad out of nowhere. There are days when you feel afraid of what the future holds. Waking up at 2:00 am with a heavy heart is fine. Being unproductive sometimes is understandable. Not having the strength to smile and pretend that everything's fine is normal. Cancelling plans just to stay at home is okay. Eating a lot or not eating at all is fine. The feeling of being burden to everyone is okay. Your feelings are valid. Just accept the fact that you are emotionally unstable right now. Don't be indenial about what you feel. You are not over-reacting. If it hurts, then it hurts. No explanation needed. 

 Just do whatever may relieve the pain you've been feeling. Cry when you feel the urge to cry. Shout when you feel like shouting. Color or chop your hair, paint your nails or hit the gym. It's your choice. Just don't hide and pretend all the time, because one day when you can't hold it anymore, you'll just explode and everything will be a lot messier.

Being anxious doesn't equate to being a failure. It doesn't mean that you are incapable of doing things. You can still have a successful career, wonderful home, and loving friends and family. Just take your time to rest and breathe until you feel the willingness to strive again. 

Let me give you a tap on your back for surviving this day. 

Let it hurt until it hurts no more.