First of all, congratulations for over 80 days free of opiates. That's an acheivement.
One of the most important things I can offer you is simply to try and be gentle with yourself right now. Opiates rewire our brains to crave them, and the desire is sometimes, unfortunately, more potent and strong than the desire to do the things that used to bring us pleasure. When I say "be gentle," I mean to eat healthy foods--give your body as many vegetables and fruits, and as much rest, and fluids as possible. Surround yourself with people who make you laugh, and make it effortless for you to socialize.
When you aren't focusing on healing your body, then you can move on to your mind/brain. Do puzzles and math to give your mind some exercise. Art is very healing during this time. Look at paintings, listen to music, and read poetry. Try to read as much as you can--you'll find some genre that won't bore you or seem too daunting. Reading is wonderful for the recovering opiate addict because it works your brain while it both gives you pleasure and occupies you. It distracts you from your negative thoughts and does miracles to transport you somewhere else.
I wish you luck and healing in the days to come.