I recommend continuing to rest, getting good nutrition and regular sleep, and being disciplined about limiting your physical and mental exertion.

I don't think you should give up, but you also need to help yourself along. You may be overloading your recovering brain with stress, exercise, and other activity/exertion. You may need to kick it back a notch, take it easy and be patient (it's a cliche, I know). Recovery is often measured in months or even years.

If you can find one of the good concussion specialists out there (I know they're hard to find), he or she may help in keeping you encouraged and in monitoring the depression.

If you're struggling with depression, be sure to seek medical help asap. Try a different doctor if you don't like the one you currently have. Be persistent and find someone who can help.

Good luck.