I agree with Trippin. This is a case of too much too soon. Yes being honest is important but if you're in treatment and not a total mess declaring your illness can wait for a while. Give them the chance to see that you're not a mess and can function. Then after a while let them know what the doctors say. Dating hurts no matter the circumstances really but without risk there is no reward. Just try not to shoot yourself in the foot after the first date.

Good luck!