Whatever you struggle with, lay it at the feet of Jesus. Gaze upon the crucified Christ, and consider His overwhelming love for you - see how much He loves you! See how much He desires your love in return! Have you not cause for joy in this? Have you not cause to lift up your heart to see that God Himself has humbled Himself for your sake, has allowed Himself to suffer the most wretched death, all in order to show you His love and mercy? Take solace in His mercy, which is divine beyond comprehension.
Or do you think that the heavens did not rejoice when you too rejected Satan and the things of this world? Or do you think they remained silent only in your case? Remain steadfast in your faith, and continue to allow your love of God to blossom. Run to Him, run to the Cross everytime you feel the desire to return to your former ways, like the Israelites who lamented their leaving Egypt (cf. Num. 11:4-6) or like the dog that returns to its vomit (cf. Prov. 26:11). Instead, no matter how unworthy you consider yourself, be the dog that gathers the crumbs that fall from the master's table (cf. Matt. 15:27).
Allow your sins to be washed in the Precious Blood of Jesus that flows from Calvary's hill - and climb this very hill in imitation of your Beloved, and there, lay your sorrow down on the ground before His feet. Lay it all down, every last bit of it. Give it all to God.
Be crucified with Christ - let all that is in you submit to the sweet and light yoke of the Savior. Do not lose hope because you were shown such sweetness in the beginning, and now experience desolation - Christ has not abandoned you; He has not led you out into the desert to die, but to overcome the world by His grace. For God "has shown [you] splendor and regal delights, ineffable, heavenly. And so, finally, man, when he compares such spiritual gifts with the things of the world, casts everything else away."2 (Pseudo-Macarius)
1 - "Letter 29"
2 - "Homily 7"